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Definition of unfaithful

unfaithful

/ʌnˈfeɪθ.fəl/
un · faith · ful
Adverb:unfaithfully
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unfaithful Lexical Profile

unfaithful Game Scores & Validity

• adjective

1

Engaging in romantic or sexual relations with someone other than one's spouse or committed partner; guilty of infidelity.

Example

"She decided to end the marriage after discovering that her husband had been unfaithful."

2

Not loyal or steadfast to a person, cause, promise, or duty; untrustworthy.

Example

"The king was ultimately betrayed by unfaithful advisors who valued their own ambition over the realm."

3

Not accurate, exact, or true to an original source, text, or fact.

Example

"Critics complained that the film adaptation was unfaithful to the spirit of the classic novel."

Synonyms
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Antonyms
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• Rhymes for unfaithful

• Nearby Words

unfair
unfairly
unfairness
unfaithful
unfaithfully
unfaithfulness
unfaked

Word Origin & Etymology

Formed in Middle English from the prefix 'un-' ('not') and 'faithful', the latter deriving from Old French 'feid' and Latin 'fides', meaning 'trust, belief, or loyalty'.

Cite this Entry

Wordmom. (2026). Definition of Unfaithful. In Wordmom Dictionary. Retrieved Nov 2, 2026, from https://wordmom.com/dictionary/unfaithful
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