Definitions

unfaithful

[uhn-feyth-fuhl] / ʌnˈfeɪθ fəl /

ADJECTIVE

disloyal, adulterous

Synonyms

STRONGEST

cheating untrue

WEAK

adulterine deceitful double-crossing faithless false false-hearted fickle foresworn inconstant incontinent moonlighting not true to of bad faith perfidious philandering recreant shifty snaky sneaking traitorous treacherous treasonable two-faced two-timing unchaste unreliable untrustworthy wicked

Antonyms

WEAK

faithful loyal trustworthy

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Then there’s the Norwegian biathlete who admitted to being unfaithful in a very public bid for forgiveness.

From The Wall Street Journal • Feb. 13, 2026

"And three months ago, I made the biggest mistake of my life and I was unfaithful," he continued.

From Barron's • Feb. 11, 2026

According to Pratt, MTV was not satisfied with him merely portraying an unfaithful boyfriend.

From Los Angeles Times • Jan. 27, 2026

Ms Trussler said during the trial MacPhail had attempted to portray her "caring, kind daughter" as a "nasty, unfaithful girlfriend" but that "could not be further from the truth".

From BBC • Oct. 31, 2024

She’s crying, and no doubt he’s trying to explain that he is not an unfaithful, disloyal jerk.

From "The Sun Is Also a Star" by Nicola Yoon

unfaithful

Example Sentences

Related Words