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infidelity

/ˌɪnfɪˈdɛlɪti/
noun

  1. Unfaithfulness in a marriage or an intimate relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.

  2. Unfaithfulness in some other moral obligation.

  3. Lack of religious belief.

Synonymsadultery, betrayal, faithlessness
Antonymsfaithfulness, fidelity, loyalty

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