unfaithful
Unfaithful (adj) means not sexually loyal to a partner; cheating. Example: “He was unfaithful to his wife for years before she found out.”
How to use unfaithful
Learner’s notesIn plain EnglishNot loyal, especially to a partner or a cause — or, of a translation, not true to the original.
Word forms
- Comparative
- more unfaithful
- Superlative
- most unfaithful
Fill the gap
Can you complete this real example?
He was _____ to his wife for years before she found out.
Etymology
From Middle English unfeithful — simply un- (\"not\") added to faithful.