Unfaithful
WordNet
adjective
(1) Not trustworthy
"An unfaithful reproduction"
(2) Not true to duty or obligation or promises
"An unfaithful lover"
(3) Having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
"Her husband was unfaithful"
(4) Having the character of, or characteristic of, a traitor
"The faithless Benedict Arnold"
"A lying traitorous insurrectionist"
WiktionaryText
Adjective
- not having religious faith
- not keeping good faith; disloyal; not faithful
- not honest or upright
- of a translation: incorrect
- adulterous