iCloud 
Delete a contact
You can delete a contact at any time.
WARNING: When you delete a contact, it is deleted on every device that has the iCloud Contacts feature turned on. For example, if your iPhone and Mac have iCloud Contacts turned on, and you delete a contact with the iCloud Contacts web app, the contact is also deleted in the Contacts app on your iPhone and Mac.
Delete a contact
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In iCloud Contacts, do either of the following:
To delete a contact completely, select the contact in the All Contacts list, then press the Delete key. Click Delete in the dialog that appears.
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To delete a contact from a group, click the group on the left, select the contact, then press the Delete key.
Deleting a contact from a group removes it from that group only.