infidelity
/ˌɪnfɪˈdɛlɪti/ noun C1- Unfaithfulness in a marriage or an intimate (sexual or romantic) relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.
- Unfaithfulness in some other moral obligation.
Plural infidelities
From the library
“The old man died, as I have told you; had he lived, Mercédès, perchance, had not become the wife of another, for he would have been there to reproach her infidelity.
None of those interesting adventures fell in his way; the lovely Genoese, Florentines, and Neapolitans were all faithful, if not to their husbands, at least to their lovers, and thought not of changing even for the splendid appearance of Albert de Morcerf; and all he gained was the painful conviction that the ladies of Italy have this advantage over those of France, that they are faithful even in their infidelity.
Learn infidelity in real texts
With a free account, hover any word in the library for its meaning, hear it read aloud, save words for review timed to your memory, and see how much of each book you already know.