diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
index bb914e34209..44301455e47 100644
--- a/pkg/analyzer_cli/lib/src/options.dart
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -22,8 +22,6 @@ const _defineVariableOption = 'D';
 const _enableExperimentOption = 'enable-experiment';
 const _enableInitializingFormalAccessFlag = 'initializing-formal-access';
 const _ignoreUnrecognizedFlagsFlag = 'ignore-unrecognized-flags';
-const _implicitCastsFlag = 'implicit-casts';
-const _noImplicitDynamicFlag = 'no-implicit-dynamic';
 const _packagesOption = 'packages';
 const _sdkPathOption = 'dart-sdk';
 
@@ -175,10 +173,6 @@ class CommandLineOptions {
     return castNullable(_argResults[_enableExperimentOption]);
   }
 
-  bool? get implicitCasts => _argResults[_implicitCastsFlag] as bool?;
-
-  bool? get noImplicitDynamic => _argResults[_noImplicitDynamicFlag] as bool?;
-
   /// Update the [analysisOptions] with flags that the user specified
   /// explicitly. The [analysisOptions] are usually loaded from one of
   /// `analysis_options.yaml` files, possibly with includes. We consider
@@ -201,16 +195,6 @@ class CommandLineOptions {
         flags: enabledExperiments,
       );
     }
-
-    var implicitCasts = this.implicitCasts;
-    if (implicitCasts != null) {
-      analysisOptions.implicitCasts = implicitCasts;
-    }
-
-    var noImplicitDynamic = this.noImplicitDynamic;
-    if (noImplicitDynamic != null) {
-      analysisOptions.implicitDynamic = !noImplicitDynamic;
-    }
   }
 
   /// Return a list of command-line arguments containing all of the given [args]
@@ -327,31 +311,10 @@ class CommandLineOptions {
         help: 'The path to the Dart SDK.', hide: ddc && hide);
     parser.addOption(_analysisOptionsFileOption,
         help: 'Path to an analysis options file.', hide: ddc && hide);
-    parser.addFlag('strong',
-        help: 'Enable strong mode (deprecated); this option is now ignored.',
-        defaultsTo: true,
-        hide: true,
-        negatable: true);
-    parser.addFlag('declaration-casts',
-        negatable: true,
-        help:
-            'Disable declaration casts in strong mode (https://goo.gl/cTLz40)\n'
-            'This option is now ignored and will be removed in a future release.',
-        hide: ddc && hide);
     parser.addMultiOption(_enableExperimentOption,
         help: 'Enable one or more experimental features. If multiple features '
             'are being added, they should be comma separated.',
         splitCommas: true);
-    parser.addFlag(_implicitCastsFlag,
-        negatable: true,
-        help: 'Disable implicit casts in strong mode (https://goo.gl/cTLz40).',
-        defaultsTo: null,
-        hide: ddc && hide);
-    parser.addFlag(_noImplicitDynamicFlag,
-        defaultsTo: null,
-        negatable: false,
-        help: 'Disable implicit dynamic (https://goo.gl/m0UgXD).',
-        hide: ddc && hide);
 
     //
     // Hidden flags and options.
@@ -520,11 +483,6 @@ class CommandLineOptions {
         }
       }
 
-      if (results.wasParsed('strong')) {
-        errorSink.writeln(
-            'Note: the --strong flag is deprecated and will be removed in an '
-            'future release.\n');
-      }
       if (results.wasParsed(_enableExperimentOption)) {
         var names =
             (results[_enableExperimentOption] as List).cast<String>().toList();
diff --git a/pkg/analyzer_cli/test/options_test.dart b/pkg/analyzer_cli/test/options_test.dart
index 397a42f4600..95528b544fc 100644
--- a/pkg/analyzer_cli/test/options_test.dart
+++ b/pkg/analyzer_cli/test/options_test.dart
@@ -61,11 +61,9 @@ void main() {
         expect(options.enabledExperiments, isEmpty);
         expect(options.displayVersion, isFalse);
         expect(options.ignoreUnrecognizedFlags, isFalse);
-        expect(options.implicitCasts, isNull);
         expect(options.log, isFalse);
         expect(options.jsonFormat, isFalse);
         expect(options.machineFormat, isFalse);
-        expect(options.noImplicitDynamic, isNull);
         expect(options.batchMode, isFalse);
         expect(options.sourceFiles, equals(['foo.dart']));
         expect(options.trainSnapshot, isFalse);
@@ -381,86 +379,6 @@ class ArgumentsTest with ResourceProviderMixin {
     });
   }
 
-  void test_updateAnalysisOptions_implicitCasts() {
-    // Turn on.
-    _applyAnalysisOptions(
-      ['--implicit-casts', 'a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitCasts = false;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitCasts, isTrue);
-      },
-    );
-
-    // Turn off.
-    _applyAnalysisOptions(
-      ['--no-implicit-casts', 'a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitCasts = true;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitCasts, isFalse);
-      },
-    );
-
-    // Don't change if not provided, false.
-    _applyAnalysisOptions(
-      ['a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitCasts = false;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitCasts, isFalse);
-      },
-    );
-
-    // Don't change if not provided, true.
-    _applyAnalysisOptions(
-      ['a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitCasts = true;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitCasts, isTrue);
-      },
-    );
-  }
-
-  void test_updateAnalysisOptions_noImplicitDynamic() {
-    _applyAnalysisOptions(
-      ['--no-implicit-dynamic', 'a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitDynamic = true;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitDynamic, isFalse);
-      },
-    );
-
-    // Don't change if not provided, false.
-    _applyAnalysisOptions(
-      ['a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitDynamic = false;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitDynamic, isFalse);
-      },
-    );
-
-    // Don't change if not provided, true.
-    _applyAnalysisOptions(
-      ['a.dart'],
-      (analysisOptions) {
-        analysisOptions.implicitDynamic = true;
-      },
-      (analysisOptions) {
-        expect(analysisOptions.implicitDynamic, isTrue);
-      },
-    );
-  }
-
   void _applyAnalysisOptions(
     List<String> args,
     void Function(AnalysisOptionsImpl) configureInitial,