- Lacking faith; lacking belief in something.
- Not observant of promises or covenants.
- Unfaithful; not of true fidelity; inconstant, as a husband or a wife.
- Serving to disappoint or deceive; delusive; unsatisfying.
- Not believing in God, religion, or a comparable ideology.
- Not true to allegiance, duty, or vows; perfidious; treacherous; disloyal.