Pronunciation: /ʌnˈfeɪθfəl/
adjective not adhering to promises, obligations, or allegiances; disloyal
A1 She felt hurt when she found out her partner was unfaithful.
A2 The unfaithful employee was caught stealing from the company.
B1 The unfaithful politician was exposed by the media.
B2 Their marriage ended due to his unfaithful behavior.
C1 The unfaithful business partner betrayed his colleagues for personal gain.
C2 The unfaithful friend's deceitful actions were finally revealed.
formal The evidence clearly showed that he was unfaithful to his wife.
informal I heard that he's been unfaithful to his girlfriend.
slang She found out he was cheating on her, he's so unfaithful.
figurative Betraying your own values is being unfaithful to yourself.
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unfaithfuls
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to be unfaithful
being unfaithful
unfaithful