Removing default widgets from WordPress

functions.php

<?php
add_action('widgets_init', 'tiny_unregister_default_widgets', 11);
function tiny_unregister_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');
  unregister_widget('Twenty_Eleven_Ephemera_Widget');
}
?>