Remove default WordPress widgets

function wpsites_remove_default_widgets() {
     unregister_widget('WP_Widget_Pages');
     unregister_widget('WP_Widget_Calendar');
     unregister_widget('WP_Widget_Archives');
     unregister_widget('WP_Widget_Links');
     unregister_widget('WP_Widget_Meta');
     unregister_widget('WP_Widget_Search');
     unregister_widget('WP_Widget_Text');
     unregister_widget('WP_Widget_Categories');
     unregister_widget('WP_Widget_Recent_Posts');
     unregister_widget('WP_Widget_Recent_Comments');
     unregister_widget('WP_Widget_RSS');
     unregister_widget('WP_Widget_Tag_Cloud');
     unregister_widget('WP_Nav_Menu_Widget');
 }
 add_action('widgets_init', 'wpsites_remove_default_widgets', 11);

Add this in your functions file or a site specific plugin.

Uses unregister widget

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