faithless

Etymology
From, equivalent to.

Adjective

 * 1) Lacking faith; lacking belief in something.
 * 2) Not believing in God, religion, or a comparable ideology.
 * 3) Unfaithful (said of people, towards their partners)
 * 4) Not observant of promises or covenants.
 * 5) Not true to allegiance, duty, or vows
 * 6) Serving to disappoint or deceive
 * 1) Not true to allegiance, duty, or vows
 * 2) Serving to disappoint or deceive
 * 1) Serving to disappoint or deceive