Synonyms of unfaithful

unfaithful

adjective

ˌən-ˈfāth-fəl 

as in traitorous

not true in one's allegiance to someone or something

colonists who later proved to be unfaithful to the cause of independence

Synonyms & Similar Words

• traitorous
• unreliable
• false
• faithless
• disloyal
• treacherous
• perfidious
• untrue
• inconstant
• fickle
• recreant
• untrustworthy
• irresponsible
• hesitant
• undependable
• uncertain
• faltering
• irresolute
• uninterested
• dubious
• apathetic
• trustless
• dispassionate
• vacillating
• wavering

Antonyms & Near Antonyms

• faithful
• loyal
• true
• constant
• responsible
• steady
• devout
• steadfast
• reliable
• devoted
• trustworthy
• fast
• dedicated
• dependable
• staunch
• dutiful
• solid
• down-the-line
• trusty
• tried
• unfaltering
• unhesitating
• determined
• resolute
• confirmed
• intent
• tried-and-true
• enthusiastic
• trustable
• inveterate
• passionate
• sworn
• unwavering
• ardent
• fervent
• impassioned
• avid
• fervid
• dyed-in-the-wool

Example Sentences

Recent Examples of unfaithful

Platner is also an unfaithful spouse who mistreats women. — Chris Roemer, Baltimore Sun, 25 June 2026

Starring Yakusho Koji, the film follows a man released on parole after killing his unfaithful wife. — Naman Ramachandran, Variety, 13 May 2026

The golden calf famously enraged Moses, showing that the Israelites had turned away from God and were unfaithful in Moses’s absence. — Britta Miller, The Washington Examiner, 9 May 2026

Portraits of him as a cheating drunk, who was unfaithful to his first wife, Julia Nye, also surfaced. — Kory Grow, Rolling Stone, 6 May 2026