Definition of infidelity in English:

infidelity

Syllabification: in·fi·del·i·ty
Pronunciation: /ˌinfiˈdelitē
 
/

noun (plural infidelities)

  • 1The action or state of being unfaithful to a spouse or other sexual partner: her infidelity continued after her marriage I ought not to have tolerated his infidelities
    More example sentences
    • Sure, there are drugs and infidelities and deviant sexuality, but that's the exception for this otherwise decent lot.
    • Affairs, infidelities, sexual peccadilloes fall generally outside the purview of inquisitive political eyes; at any rate, they do not make for fodder for a dirty election campaign.
    • My lovely partner, Patrick, suffered the knowledge of my infidelities and witnessed my mental, physical, and spiritual decay.
    Synonyms
    unfaithfulness, adultery, cuckoldry, disloyalty, extramarital sex; deceit, falseness; affair, liaison, fling, amour
    informal fooling/playing around, cheating, two-timing, hanky-panky
    formal fornication
  • 2Unbelief in a particular religion, especially Christianity.
    More example sentences
    • It is said that he wouldn't stay in a room with men whose conversation was marked by infidelity and blasphemy.
    • As a result of their infidelity, the people descended into moral and spiritual corruption.
    • They are the righteous ones whose garments have not been soiled by infidelity to the patron of the universe.

Origin

late Middle English (in the senses 'lack of faith' and 'disloyalty'): from Old French infidelite or Latin infidelitas, from infidelis 'not faithful' (see infidel).

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