infidelitynoun [ C or U ]
uk/ˌɪn.fɪˈdel.ə.ti/us/ˌɪn.fəˈdel.ə.t̬i/(an act of) having sex with someone who is not your husband, wife, or regular sexual partner:
marital/sexual infidelity
She could not forgive his many infidelities.
Thesaurus: synonyms and related words
Disloyalty, betrayal & treason
- adultery
- backstabber
- betray
- betrayal
- break ranks idiom
- collaborate
- deserter
- desertion
- double-cross
- faithless
- false
- fifth column
- high treason
- sellout
- stab
- stab sb in the back idiom
- traitor
- treacherous
- treachery
- treason
See more results »
You can also find related words, phrases, and synonyms in the topics:
Relationships: infidelity