unfaithful

adjectives

not true to duty or obligation or promises

"an unfaithful lover"

unfaithful

is derived from

unfaithfulness

antonym

faithful

is similar to

not faithful to religion or party or cause

apostate

is similar to

tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans

"Punic faith"; "the perfidious Judas"; "the fiercest and most treacherous of foes"; "treacherous intrigues"

perfidious, punic, treacherous

is similar to

not true to an obligation or trust

"is untrue to his highest opportunity and duty"-Bruno Laske

untrue

see also

not worthy of trust or belief

"an untrustworthy person"

untrustworthy, untrusty

is an attribute of

the quality of being faithful

faithfulness, fidelity

having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend

"her husband was unfaithful"

unfaithful

is derived from

unfaithfulness

antonym

faithful

is similar to

not faithful to a spouse or lover

"adulterous husbands and wives"; "a two-timing boyfriend"

adulterous, cheating, two-timing

having the character of, or characteristic of, a traitor

"the faithless Benedict Arnold"; "a lying traitorous insurrectionist"

faithless, traitorous, treasonable, treasonous, unfaithful

is derived from

unfaithfulness

not trustworthy

"an unfaithful reproduction"

unfaithful

is similar to

not exact

"an inaccurate translation"; "the thermometer is inaccurate"

inaccurate