Longman Dictionary of Contemporary English homepage

unfaithful

 adjective
     
un‧faith‧ful
someone who is unfaithful has sex with someone who is not their wife, husband, or usual partner
unfaithful to
Geoff had been unfaithful to her on many occasions.
—unfaithfully adverb
—unfaithfulness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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