Whatsapp sync issue in Google Nexus 5 its not deleting the contact I have Google Nexus 5. My Whatsapp contacts are not deleting.

When I am trying to delete the contact from People (Contact App) it shows the error message
"You can't delete contacts from read-only accounts, but you can hide them in your contacts lists"

I deleted the contacts from my Google account but I am able to see those contacts in Whatsapp.
you might be having merged contact which you are trying to delete. To delete the whatsapp from the contact, you would have to delete the contact from phone list and then delete the contact from whatsapp. Obvisouly, you and again save the numbers in the contact list.