adjective
Not loyal to a husband, wife, or romantic partner because of a romantic or sexual relationship with someone else.
She discovered that her husband was unfaithful.
Common phrases & grammar
an unfaithful partner · be unfaithful to someone
American English
How to pronounce unfaithful
adjectiveB2
uhnFEYTHfl
/ənˈfeɪθ.fl̩/
3 syllables · Stress the second syllable.
Not loyal to a husband, wife, or romantic partner because of a romantic or sexual relationship with someone else.
Practice out loudMeanings & examples
adjectiveless common
Not loyal to a person, group, promise, or belief.
He was unfaithful to the principles he had promised to defend.
adjectiveless common
Not showing or following an original work accurately.
The film is an unfaithful adaptation of the novel.
Common phrases & grammar
an unfaithful translation · an unfaithful adaptation