Synonyms of infidelity in English:

infidelity

noun

  • her husband never knew of her infidelity
    unfaithfulness, adultery, unchastity, cuckoldry, extramarital relations, extramarital sex; faithlessness, disloyalty, falseness, breach of trust, treachery, double-dealing, duplicity, deceit, perfidy, perfidiousness; affair, liaison, intrigue, amour
    informal fooling around, playing around, playing the field, cheating, two-timing, hanky-panky, a bit on the side
    formal fornication
    [Antonyms] fidelity faithfulness
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