diff --git a/addons/point_of_sale/static/src/js/models.js b/addons/point_of_sale/static/src/js/models.js
index 20f8059df6f..97d0644c2b7 100644
--- a/addons/point_of_sale/static/src/js/models.js
+++ b/addons/point_of_sale/static/src/js/models.js
@@ -1277,7 +1277,7 @@ export class PosGlobalState extends PosModel {
             taxes = [...taxes].sort(function (tax1, tax2) {
                 return tax1.sequence - tax2.sequence;
             });
-            _(taxes).each(function (tax) {
+            taxes.forEach((tax) => {
                 if (tax.amount_type === "group") {
                     all_taxes = _collect_taxes(tax.children_tax_ids, all_taxes);
                 } else {
@@ -1328,7 +1328,7 @@ export class PosGlobalState extends PosModel {
 
         var cached_tax_amounts = {};
         if (handle_price_include) {
-            _(taxes.reverse()).each(function (tax) {
+            taxes.reverse().forEach(function (tax) {
                 if (tax.include_base_amount) {
                     base = recompute_base(
                         base,
@@ -1378,7 +1378,7 @@ export class PosGlobalState extends PosModel {
         var taxes_vals = [];
         i = 0;
         var cumulated_tax_included_amount = 0;
-        _(taxes.reverse()).each(function (tax) {
+        taxes.reverse().forEach(function (tax) {
             if (tax.price_include || tax.is_base_affected) {
                 var tax_base_amount = base;
             } else {
@@ -2458,7 +2458,7 @@ export class Orderline extends PosModel {
             qty,
             this.pos.currency.rounding
         );
-        _(all_taxes.taxes).each(function (tax) {
+        all_taxes.taxes.forEach(function (tax) {
             taxtotal += tax.amount;
             taxdetail[tax.id] = tax.amount;
         });
@@ -2481,7 +2481,7 @@ export class Orderline extends PosModel {
             var mapped_included_taxes = [];
             var new_included_taxes = [];
             var self = this;
-            _(taxes).each(function (tax) {
+            taxes.forEach((tax) => {
                 var line_taxes = self.pos.get_taxes_after_fp([tax.id], order.fiscal_position);
                 if (line_taxes.length && line_taxes[0].price_include) {
                     new_included_taxes = new_included_taxes.concat(line_taxes);
diff --git a/addons/portal_rating/static/src/xml/portal_tools.xml b/addons/portal_rating/static/src/xml/portal_tools.xml
index c85fb5f2daf..46c39d2e432 100644
--- a/addons/portal_rating/static/src/xml/portal_tools.xml
+++ b/addons/portal_rating/static/src/xml/portal_tools.xml
@@ -8,13 +8,13 @@
              t-att-style="inline_mode ? 'display:inline' : ''"
              t-attf-aria-label="#{Math.round(val * 100) / 100} stars on 5"
              t-attf-title="#{Math.round(val * 100) / 100} stars on 5">
-            <t t-foreach="_.range(0, val_integer)" t-as="num">
+            <t t-foreach="range(0, val_integer)" t-as="num">
                 <i class="fa fa-star" role="img"></i>
             </t>
             <t t-if="val_decimal">
                 <i class="fa fa-star-half-o" role="img"></i>
             </t>
-            <t t-foreach="_.range(0, empty_star)" t-as="num">
+            <t t-foreach="range(0, empty_star)" t-as="num">
                 <i class="fa fa-star text-black-25" role="img"></i>
             </t>
         </div>
@@ -74,13 +74,13 @@
             <t t-set="empty_star" t-value="5 - (val_integer+Math.ceil(val_decimal))"/>
 
             <div class="stars enabled">
-                <t t-foreach="_.range(0, val_integer)" t-as="num">
+                <t t-foreach="range(0, val_integer)" t-as="num">
                     <i class="fa fa-star" role="img" aria-label="Full star"></i>
                 </t>
                 <t t-if="val_decimal">
                     <i class="fa fa-star-half-o" role="img" aria-label="Half a star"></i>
                 </t>
-                <t t-foreach="_.range(0, empty_star)" t-as="num">
+                <t t-foreach="range(0, empty_star)" t-as="num">
                     <i class="fa fa-star-o text-black-25" role="img" aria-label="Empty star"></i>
                 </t>
             </div>
diff --git a/addons/web/__manifest__.py b/addons/web/__manifest__.py
index 43614060017..32c7e59f1bb 100644
--- a/addons/web/__manifest__.py
+++ b/addons/web/__manifest__.py
@@ -76,8 +76,6 @@ This module provides the core of the Odoo Web Client.
             'web/static/src/session.js',
             'web/static/src/legacy/js/core/cookie_utils.js',
 
-            'web/static/lib/underscore/underscore.js',
-            'web/static/lib/underscore.string/lib/underscore.string.js',
             'web/static/lib/moment/moment.js',
             'web/static/lib/luxon/luxon.js',
             'web/static/lib/owl/owl.js',
@@ -123,7 +121,6 @@ This module provides the core of the Odoo Web Client.
             'web/static/src/legacy/js/libs/download.js',
             'web/static/src/legacy/js/libs/jquery.js',
             'web/static/src/legacy/js/libs/moment.js',
-            'web/static/src/legacy/js/libs/underscore.js',
             'web/static/src/legacy/js/libs/pdfjs.js',
             'web/static/src/legacy/js/libs/zoomodoo.js',
             'web/static/src/legacy/js/libs/jSignatureCustom.js',
@@ -307,8 +304,6 @@ This module provides the core of the Odoo Web Client.
 
             ('include', 'web.assets_frontend_minimal'),
 
-            'web/static/lib/underscore/underscore.js',
-            'web/static/lib/underscore.string/lib/underscore.string.js',
             'web/static/lib/moment/moment.js',
             'web/static/lib/owl/owl.js',
             'web/static/lib/owl/odoo_module.js',
@@ -354,7 +349,6 @@ This module provides the core of the Odoo Web Client.
             'web/static/src/legacy/js/libs/download.js',
             'web/static/src/legacy/js/libs/jquery.js',
             'web/static/src/legacy/js/libs/moment.js',
-            'web/static/src/legacy/js/libs/underscore.js',
             'web/static/src/legacy/js/libs/pdfjs.js',
             'web/static/src/legacy/js/libs/zoomodoo.js',
             'web/static/src/legacy/js/libs/jSignatureCustom.js',
diff --git a/addons/web/static/lib/py.js/lib/py_extras.js b/addons/web/static/lib/py.js/lib/py_extras.js
index 367539c6fe9..0f4ae0134e3 100644
--- a/addons/web/static/lib/py.js/lib/py_extras.js
+++ b/addons/web/static/lib/py.js/lib/py_extras.js
@@ -326,15 +326,14 @@ datetime.timedelta = py.type('timedelta', null, {
                 ss = s;
             });
         });
-        var s = _.str.sprintf("%d:%02d:%02d", hh, mm, ss);
+        var s = `${hh.toFixed(0)}:${mm.toFixed(0).padStart(2,"0")}:${ss.toFixed(0).padStart(2,"0")}` 
         if (this.days) {
-            s = _.str.sprintf("%d day%s, %s",
-                this.days,
-                (this.days != 1 && this.days != -1) ? 's' : '',
-                s);
+                s = `${this.days.toFixed(0)} day${
+                    this.days != 1 && this.days != -1 ? "s" : ""
+                }, ${s}`;
         }
         if (this.microseconds) {
-            s = _.str.sprintf("%s.%06d", s, this.microseconds);
+                s = `${s}.${this.microseconds.toFixed(0).padStart(6, "0")}`;
         }
         return py.str.fromJSON(s);
     },
@@ -545,12 +544,18 @@ datetime.datetime = py.type('datetime', null, {
         return py.str.fromJSON(args.format.toJSON()
             .replace(/%([A-Za-z])/g, function (m, c) {
                 switch (c) {
-                case 'Y': return _.str.sprintf('%04d', self.year);
-                case 'm': return _.str.sprintf('%02d', self.month);
-                case 'd': return _.str.sprintf('%02d', self.day);
-                case 'H': return _.str.sprintf('%02d', self.hour);
-                case 'M': return _.str.sprintf('%02d', self.minute);
-                case 'S': return _.str.sprintf('%02d', self.second);
+                        case "Y":
+                            return self.year.toFixed(0).padStart(4, "0");
+                        case "m":
+                            return self.month.toFixed(0).padStart(2, "0");
+                        case "d":
+                            return self.day.toFixed(0).padStart(2, "0");
+                        case "H":
+                            return self.hour.toFixed(0).padStart(2, "0");
+                        case "M":
+                            return self.minute.toFixed(0).padStart(2, "0");
+                        case "S":
+                            return self.second.toFixed(0).padStart(2, "0");
                 }
                 throw new Error('ValueError: No known conversion for ' + m);
             }));
@@ -635,8 +640,8 @@ datetime.date = py.type('date', null, {
             .replace(/%([A-Za-z])/g, function (m, c) {
                 switch (c) {
                 case 'Y': return self.year;
-                case 'm': return _.str.sprintf('%02d', self.month);
-                case 'd': return _.str.sprintf('%02d', self.day);
+                case 'm': return self.month.toFixed(0).padStart(2, "0");
+                case 'd': return  self.day.toFixed(0).padStart(2, "0");
                 }
                 throw new Error('ValueError: No known conversion for ' + m);
             }));
@@ -786,9 +791,13 @@ time.strftime = py.PY_def.fromJSON(function () {
     return py.PY_call(py.PY_getAttr(d, 'strftime'), [args.format]);
 });
 
-var args = _.map(('year month day hour minute second '
-                + 'years months weeks days hours minutes seconds '
-                + 'weekday leapdays yearday nlyearday').split(' '), function (arg) {
+var args = (
+    'year month day hour minute second '+ 
+    'years months weeks days hours minutes seconds '+ 
+    'weekday leapdays yearday nlyearday'
+)
+.split(" ")
+.map( (arg) => {
     switch (arg) {
         case 'years':case 'months':case 'days':case 'leapdays':case 'weeks':
         case 'hours':case 'minutes':case 'seconds':
diff --git a/addons/web/static/src/legacy/js/core/py_utils.js b/addons/web/static/src/legacy/js/core/py_utils.js
index b16e23f7fa5..fc6f081c7c6 100644
--- a/addons/web/static/src/legacy/js/core/py_utils.js
+++ b/addons/web/static/src/legacy/js/core/py_utils.js
@@ -106,7 +106,7 @@ function wrap_context(context) {
 
 function eval_contexts(contexts, evaluation_context) {
     evaluation_context = Object.assign(pycontext(), evaluation_context || {});
-    return _(contexts).reduce(function (result_context, ctx) {
+    return contexts.reduce((result_context, ctx) => {
         // __eval_context evaluations can lead to some of `contexts`'s
         // values being null, skip them as well as empty contexts
         if (Object.keys(ctx || {}).length === 0) { return result_context; }
@@ -143,7 +143,7 @@ function eval_domains(domains, evaluation_context) {
         domains[0].length === 1 &&
         (domains[0][0] === "|" || domains[0][0] === "!")
     );
-    _(domains).each(function (domain) {
+    (domains || []).forEach(function (domain) {
         if (typeof domain === "string") {
             // wrap raw strings in domain
             domain = { __ref: 'domain', __debug: domain };
@@ -189,7 +189,7 @@ function get_normalized_domain(domain_array) {
 function eval_groupbys(contexts, evaluation_context) {
     evaluation_context = Object.assign(pycontext(), evaluation_context || {});
     var result_group = [];
-    _(contexts).each(function (ctx) {
+    (contexts || []).forEach(function (ctx) {
         if (typeof ctx === "string") {
             // wrap raw strings in context
             ctx = { __ref: 'context', __debug: ctx };
diff --git a/addons/web/static/src/legacy/js/core/qweb.js b/addons/web/static/src/legacy/js/core/qweb.js
index 8aa392abee3..6710a1b9f54 100644
--- a/addons/web/static/src/legacy/js/core/qweb.js
+++ b/addons/web/static/src/legacy/js/core/qweb.js
@@ -1,5 +1,7 @@
 /** @odoo-module alias=web.QWeb **/
 
+import { uniqueId } from "@web/core/utils/functions";
+import { range } from "@web/core/utils/numbers";
 import translation from "web.translation";
 
 var _t = translation._t;
@@ -18,7 +20,9 @@ function QWeb(debug, default_dict, enableTranslation) {
     }
     var qweb = new QWeb2.Engine();
     qweb.default_dict = Object.assign({}, default_dict || {}, {
-        '_' : _,
+        // '_' : _,
+        'uniqueId': uniqueId,
+        'range' : range,
         'JSON': JSON,
         '_t' : translation._t,
         '__debug__': debug,
diff --git a/addons/web/static/src/legacy/js/libs/jquery.js b/addons/web/static/src/legacy/js/libs/jquery.js
index 8ff95b0b5a6..1089b44bc3d 100644
--- a/addons/web/static/src/legacy/js/libs/jquery.js
+++ b/addons/web/static/src/legacy/js/libs/jquery.js
@@ -114,7 +114,7 @@ $.fn.extend({
         events = events.split(' ');
         return this.each(function () {
             var el = this;
-            _.each(events, function (evNameNamespaced) {
+            events.forEach((evNameNamespaced) => {
                 var evName = evNameNamespaced.split('.')[0];
                 var handler = $._data(el, 'events')[evName].pop();
                 $._data(el, 'events')[evName].unshift(handler);
diff --git a/addons/web/static/src/legacy/js/widgets/model_field_selector.js b/addons/web/static/src/legacy/js/widgets/model_field_selector.js
index bfbe3049f16..0b494f32a00 100644
--- a/addons/web/static/src/legacy/js/widgets/model_field_selector.js
+++ b/addons/web/static/src/legacy/js/widgets/model_field_selector.js
@@ -155,6 +155,9 @@ var ModelFieldSelector = Widget.extend({
         this.$value.html(core.qweb.render(this.template + ".value", {
             chain: this.popover.chain,
             pages: this.popover.pages,
+            findByName : (array, name) => {
+                return (array || []).find((arr) => arr.name === name)
+            }
         }));
 
         // Toggle the warning message
diff --git a/addons/web/static/src/legacy/xml/base.xml b/addons/web/static/src/legacy/xml/base.xml
index 1d0f74a4535..5d2467b1eb5 100644
--- a/addons/web/static/src/legacy/xml/base.xml
+++ b/addons/web/static/src/legacy/xml/base.xml
@@ -478,7 +478,7 @@
                 <t t-esc="fieldName"/>
             </t>
             <t t-else="">
-                <t t-set="fieldInfo" t-value="_.findWhere(pages[fieldName_index], {'name': fieldName})"/>
+                <t t-set="fieldInfo" t-value="findByName(pages[fieldName_index], fieldName)"/>
                 <t t-esc="fieldInfo &amp;&amp; fieldInfo.string || '?'"/>
             </t>
         </span>
@@ -504,7 +504,7 @@
 
 <t t-name="web.datepicker">
     <t t-set="placeholder" t-value="widget.getParent().node and widget.getParent().node.attrs.placeholder"/>
-    <t t-set="datepickerID" t-value="_.uniqueId('datepicker')"/>
+    <t t-set="datepickerID" t-value="uniqueId('datepicker')"/>
     <div class="o_datepicker" aria-atomic="true" t-att-id="datepickerID" data-target-input="nearest">
         <input type="text"
             class="o_datepicker_input o_input datetimepicker-input"
diff --git a/addons/web/static/src/legacy/xml/dialog.xml b/addons/web/static/src/legacy/xml/dialog.xml
index 0b615dbcf24..3fea5f06036 100644
--- a/addons/web/static/src/legacy/xml/dialog.xml
+++ b/addons/web/static/src/legacy/xml/dialog.xml
@@ -8,7 +8,7 @@
         t-attf-class="modal o_legacy_dialog #{ technical ? ' o_technical_modal' : '' } #{ fullscreen ? ' o_modal_full': '' }"
         tabindex="-1"
         data-bs-backdrop="static"
-        t-att-id="_.uniqueId('modal_')"
+        t-att-id="uniqueId('modal_')"
         aria-hidden="true"
         >
         <div class="modal-dialog">
diff --git a/addons/website/static/src/snippets/s_website_form/000.js b/addons/website/static/src/snippets/s_website_form/000.js
index 15caf59d696..827615d6648 100644
--- a/addons/website/static/src/snippets/s_website_form/000.js
+++ b/addons/website/static/src/snippets/s_website_form/000.js
@@ -278,10 +278,10 @@
             if (!self.check_error_fields({})) {
                 if (this.fileInputError) {
                     const errorMessage = this.fileInputError.type === "number"
-                        ? _.str.sprintf(_t(
+                        ? sprintf(_t(
                             "Please fill in the form correctly. You uploaded too many files. (Maximum %s files)"
                         ), this.fileInputError.limit)
-                        : _.str.sprintf(_t(
+                        : sprintf(_t(
                             "Please fill in the form correctly. The file \"%s\" is too big. (Maximum %s MB)"
                         ), this.fileInputError.fileName, this.fileInputError.limit);
                     this.update_status("error", errorMessage);