noun
the action or state of being unfaithful to a spouse or other sexual partner
adjective
relating to the action or state of being unfaithful
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Infidelity in a marriage is considered a breach of trust and can have serious consequences.
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I heard rumors of infidelity between the boss and his secretary.
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Cheating is just plain wrong, no matter how you spin it.
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Betrayal in any form is like infidelity to the heart.