Part of speech:
The definition of perfidious is someone or something that cannot be trusted or that is dishonest.
Having broken the marriage vow
Uttering falsehood; dishonest or deceitful.
Contrary to fact; false.
The definition of deceitful is someone or something intentionally untruthful or intended to mislead.
Marked by or exhibiting a lack of reliability.
Relating to, constituting, or involving treason:
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
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 derelict is something that has become deserted or neglected or a person who is grossly negligent in fulfilling his duties.
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
Worthy of trust; dependable; reliable
Not true to duty or obligation
Managing for an owner; acting as trustee
Find another word for unfaithful. In this page you can discover 41 synonyms, antonyms, idiomatic expressions, and related words for unfaithful, like: perfidious, of bad faith, philandering, false, untrue, deceitful, foresworn, unreliable, treasonable, not true to and treacherous.