If you say that someone is faithless, you mean that they are disloyal or dishonest.
...a revenge plot against a faithless lover.
Synonyms: disloyal, unreliable, unfaithful, untrustworthy More Synonyms of faithless
faithless in British English
(ˈfeɪθlɪs)
adjective
1.
unreliable or treacherous
2.
dishonest or disloyal
3.
having no faith or trust
4.
lacking faith, esp religious faith
Derived forms
faithlessly (ˈfaithlessly)
adverb
faithlessness (ˈfaithlessness)
noun
faithless in American English
(ˈfeɪθlɪs)
adjective
1.
not keeping faith; dishonest; disloyal
2.
unreliable; undependable
3.
lacking faith; unbelieving
SYNONYMY NOTE: faithless implies failure to adhere as to an oath or obligation [a faithless wife]; false, in this connection more or less synonymous with , faithless, stresses failure in devotion to someone or something that has a moral claim to one'ssupport [a false friend]; disloyal implies a breach of allegiance to a person, cause, institution, etc. [disloyal to one's family]; traitorous strictly implies the commission of treason; , treacherous suggests an inclination or tendency to betray a trust [his treacherous colleagues]; perfidious adds to the meaning of , treacherous a connotation of sordidness or depravity [a perfidious informer]
OPPOSITE: faithful
Derived forms
faithlessly (ˈfaithlessly)
adverb
faithlessness (ˈfaithlessness)
noun
Word origin
ME feithles
Examples of 'faithless' in a sentence
faithless
I think about Christian sometimes and his faithless wife and how he lost her.
Hugo Wilcken THE EXECUTION (2002)
How she must hate looking more like her faithless aunt than her sainted mother.
Patricia Gaffney FLIGHT LESSONS (2002)
(adjective)
Definition
treacherous or disloyal
She decided to divorce her increasingly faithless and unreliable husband.
Synonyms
disloyal
He proved to be an untrustworthy and disloyal ally.
unreliable
She had proved to be an unreliable witness and had lied to police.
unfaithful
They denounced him as unfaithful to the traditions of the Society.
untrustworthy
His opponents still say he's a fundamentally untrustworthy figure.
doubting
false
She was a false friend, envious of her lifestyle and her success.
untrue
untrue to the basic tenets of socialism
treacherous
The President spoke of the treacherous intentions of the enemy.
dishonest
He had become rich by dishonest means.
fickle
They are fickle, faithless and lewd.
perfidious (literary)
She says that politicians are a perfidious breed.
untruthful
Some people may be tempted to give untruthful answers.
traitorous
the betrayal of men by their most traitorous companions
unbelieving
inconstant
false-hearted
recreant (archaic)
Additional synonyms
in the sense of dishonest
Definition
not honest or fair
He had become rich by dishonest means.
Synonyms
deceitful,
corrupt,
crooked (informal),
designing,
lying,
bent (slang),
false,
unfair,
cheating,
deceiving,
shady (informal),
fraudulent,
treacherous,
deceptive,
unscrupulous,
crafty,
swindling,
disreputable,
untrustworthy,
double-dealing,
unprincipled,
mendacious,
perfidious (literary),
untruthful,
guileful,
knavish (archaic)
in the sense of false
She was a false friend, envious of her lifestyle and her success.