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English definition of “unfaithful”

unfaithful

adjective
 
 
/ʌnˈfeɪθfəl/
having sex with someone who is not your wife, husband, or usual sexual partner: She was unfaithful to me.Disloyalty, betrayal and treasonInfidelity in relationships
(Definition of unfaithful from the Cambridge Learners Dictionary © Cambridge University Press)
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