If your WhatsApp contact list is huge and it has become increasingly difficult to manage, perhaps it is best to delete some of the contacts that you no longer communicate with.
WhatsApp uses the phone book of your mobile device to create your contact list. Only your contacts using the app are automatically added to the Contacts tab. Therefore, deleting a contact from WhatsApp will also remove it from the Contacts list on your Android device. This can be done through WhatsApp or directly from the Contacts list.
How To Remove a WhatsApp Contact from Android Phone
Open WhatsApp and go to the Contacts tab. Then find and select the contact you want to delete. Click on its name at the top of the screen or press Menu (button with 3 vertical points) and select View contact:
On the Contact Information screen, press Menu (3-point icon) and select View in address book:
Press Delete (button in the form of trash can) and press OK to confirm:
To delete it directly from the Contacts list, open Contacts, find the contact you want to delete and click on its name to select it. Then press Delete (Recycle Bin button) and press OK to confirm:
Finally, refresh your WhatsApp contact list: open WhatsApp, go to the Contacts tab, press Menu and select Refresh:
While your contact has been removed from your list, your contact can still send you messages. To stop receiving messages from this person, you must block the person in WhatsApp.
Also, keep in mind that even if you delete a contact, the conversation history with that contact will still appear on the CHATS tab. To delete this history, press the contact name for a couple of seconds and select Delete chat: