in·fi·del·i·ty
noun/ˌɪnfɪˈdeləti/
/ˌɪnfɪˈdeləti/
[uncountable, countable] (plural infidelities)
- the act of not being faithful to your wife, husband or partner, by having sex with somebody else
（夫妻或伴侣间的）不忠行为，不贞 - marital infidelity
对婚姻的不忠诚 - She could not forgive his infidelities.
她无法原谅他的不忠行为。 - her infidelity to her husband
她对丈夫的不忠 - His reputation has been damaged by allegations of marital infidelity.
他被指对婚姻不忠，名誉受到了损害。
Word Originlate Middle English (in the senses ‘lack of faith’ and ‘disloyalty’): from Old French infidelite or Latin infidelitas, from infidelis ‘not faithful’, from in- ‘not’ + fidelis ‘faithful’ (from fides ‘faith’, related to fidere ‘to trust’). - marital infidelity