Reverse Dictionary: UNFAITHFUL

ADJECTIVES
► FALSE-HEART false-hearted; deceitful; unfaithful → 1593 obs.
► INFIDOUS faithless, unfaithful; not to be trusted → 1656 obs.
► STRUMPET promiscuous, unfaithful, fickle → 1382

NOUNS
► UNTROTH unfaithfulness, treachery → 1374 obs.
► UNTROWNESS unfaithfulness, breach of trust → a1200 obs.

NOUNS – PERSON
► BED-SWERVER one unfaithful to the marriage bed; an adulterer → 1611 obs.
► CUCK a cuckold; the husband of an unfaithful wife → 1706 obs.
► CUCKOLD the husband of an unfaithful wife → a1250
► CUCKQUEAN a woman whose husband is unfaithful to her; a female cuckold → 1562 obs.
► MANTHRAX unfaithful men → 2002 US sl.
► MESSER a man, or a woman, that does not keep to one lover → c1916 Brit. sl.
► MONKEY the person with whom one’s partner is having an affair; ‘the other woman’ → 1989 US students’ sl.
► MOONLIGHTER one who betrays their regular partner → 1968 US teen sl.
► SKIMMINGTON the man or woman personating the ill-used husband or the offending wife in the procession intended to ridicule the one or the other (obsolete); also, a husband whose wife is unfaithful to him; a shrewish woman → 1609 obs.
► TWO-TIMER someone who double-crosses or is unfaithful → 1927 sl., orig. US

VERBS
► BAD-TIME to be unfaithful to one’s spouse or lover → M20 US sl.
► BAG OFF to be sexually promiscuous or unfaithful → 1990s UK sl.
► BEAT SOMEONE’S TIME to cheat or be cheated in a love affair → 1930s African-American & students’ sl.
► BUTTERFLY to be sexually unfaithful to → 1945-46 US military in Far East usage
► CHIP to be sexually unfaithful → 1978 Amer. sl.
► CHIPPY to be sexually promiscuous or unfaithful; also, to whore → 1930 Amer. sl.
► CHIPPY ON SOMEONE of a male: to be sexually unfaithful to someone; to step out with a ‘chippy’ → 20C US sl.
► CHISEL to be unfaithful → 1943 Amer. sl.
► CREEP to be sexually unfaithful → 1972 US sl.
► CUCKQUEAN to make a cuckquean of → 1592 obs.
► GRAZE IN ANOTHER PADDOCK to become (sexually) unfaithful to a permanent spouse or partner → 1997 NZ sl.
► JUMP OUT to be unfaithful → 1980s  African-American sl.
► SNEAK OUT ON to be sexually unfaithful to one’s mate or spouse → 20C US colloq.
► STEP OUT ON SOMEONE to be romantically or sexually unfaithful to someone → 1940s US sl.
► STRETCH THE RUBBER to be unfaithful to one’s wife or mistress → M20 US criminals’ sl.
► STRUMPET to behave in an unfaithful manner → 1627 obs.
► TRIFLE ON to be unfaithful to; to cheat on → 1923 Amer. dial.
► TWO-TIME to betray, to deceive or be unfaithful to someone, esp. a partner or lover → 1924 sl., orig. US
► YARD ► YARD ON to have sexual relations with someone other than one’s spouse or current lover; to be unfaithful → 1960 US sl.