Main entry: unfaithful
Definition: not true to duty or obligation or promises
Usage: an unfaithful lover
Antonyms: faithful
Definition: steadfast in affection or allegiance
Main entry: unfaithful
Definition: having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
Usage: her husband was unfaithful
Antonyms: faithful
Definition: not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend
Main entry: unfaithful
Definition: not trustworthy
Usage: an unfaithful reproduction
Antonyms: accurate
Definition: conforming exactly or almost exactly to fact or to a standard or performing with total accuracy
Main entry: treasonable, treasonous, unfaithful, traitorous, faithless
Definition: having the character of, or characteristic of, a traitor
Usage: the faithless Benedict Arnold; a lying traitorous insurrectionist
Antonyms: loyal
Definition: steadfast in allegiance or duty