Part of speech:
The definition of perfidious is someone or something that cannot be trusted or that is dishonest.
Having broken the marriage vow
Relating to, constituting, or involving treason:
Uttering falsehood; dishonest or deceitful.
The definition of deceitful is someone or something intentionally untruthful or intended to mislead.
The definition of treacherous is someone who is guilty of dishonesty or betrayal, or something that is dangerous or hazardous.
(Informal) Having or showing a tricky or deceitful nature; evasive
Marked by or exhibiting a lack of reliability.
Relating to, characterized by, or guilty of, adultery
Without the normal ability to restrain a particular natural discharge, as of urine, from the body
Remaining steady in affections or loyalties; faithful
Having or demonstrating undivided and constant support for someone or something.
Evil or immoral:
Guilty of apostasy
The definition of dishonest is a person who cheats or lies.
Changeable or unstable in affection, interest, loyalty, etc.; capricious
The definition of inaccurate is something incorrect or wrong.
Changing or varying, especially often and without discernible pattern or reason.
Failing to keep faith; disloyal; traitorous
Of or like a renegade; disloyal
Not faithful or loyal
Worthy of trust; dependable; reliable
Not true to duty or obligation
The definition of derelict is something that has become deserted or neglected or a person who is grossly negligent in fulfilling his duties.
Managing for an owner; acting as trustee
Find another word for unfaithful. In this page you can discover 45 synonyms, antonyms, idiomatic expressions, and related words for unfaithful, like: perfidious, philandering, treasonable, of bad faith, false, deceitful, foresworn, not true to, treacherous, untrustworthy and shifty.