- (a.) Not faithful; not observant of promises, vows, allegiance or duty; violating trust or confidence; treacherous; perfidious; as, an unfaithful subject; an unfaithful agent or servant.
- (a.) Not possessing faith; infidel.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Unfaithful. Retrieved September 29, 2026, from http://smartdefine.org/unfaithful/definitions/2076990 |
| Chicago | Webster's. 2011. "Unfaithful" http://smartdefine.org/unfaithful/definitions/2076990 (accessed September 29, 2026). |
| Harvard | Webster's 2011, Unfaithful, Smart Define, viewed 29 September, 2026, <http://smartdefine.org/unfaithful/definitions/2076990>. |
| MLA | Webster's. "Unfaithful" 28 May 2011. Web. 29 September 2026. <http://smartdefine.org/unfaithful/definitions/2076990> |