unfaithful meaning and definition

UNFAITHFUL adjective

Definition of unfaithful (adjective)

1. not true to duty or obligation or promises
   • "an unfaithful lover"
   • antonym: faithful
2. having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
   • "her husband was unfaithful"
   • antonym: faithful
3. having the character of, or characteristic of, a traitor
   • "the faithless Benedict Arnold"; "a lying traitorous insurrectionist"
   • synonyms: faithless, traitorous, treasonable, treasonous
4. not trustworthy
   • "an unfaithful reproduction"