The CKEditor for Drupal module can be unistalled at any time by using the Drupal Administration panel. Follow the steps described below to remove CKEditor from your Drupal website.
Firstly, go to the Administration panel > Modules > User interface.
Now deselect the Enabled checkbox next to CKEditor module name. Click the Save Configuration button to disable the editor.
When the configuration is saved, go to the Uninstall tab of the Modules page. The CKEditor module should now be available to uninstall.
Select the Uninstall checkbox next to the module name and click the Uninstall button. CKEditor for Drupal will now be removed from your Drupal site.
Please note that the uninstallation process removes the CKEditor for Drupal module along with all its database tables and settings. It does not, however, remove the module files. If you want to completely remove the files from your server, you will need to delete them manually from the drupal/sites/all/modules/ckeditor
directory.