noun
infidelity
ihn-fih-DEH-lih-tee
noun
1
Sexual or romantic unfaithfulness to a spouse or partner.
"Their marriage broke down after his infidelity came to light."
"She never fully trusted anyone again after his infidelity."
2
Disloyalty to a duty, cause, or belief.
"The pamphlet accused the minister of infidelity to his own party's principles."
How to Use Infidelity
Learner’s notesIn plain EnglishCheating on a partner, or more broadly, being disloyal.
Common pairings
marital infidelity
commit infidelity
accuse of infidelity
Word Forms
infidelities plural
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Their marriage broke down after his _____ came to light.
Etymology
From Latin infidelitas, built on infidelis ("unfaithful") — see infidel.