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un·faith·ful / ˌənˈfā[unvoicedth]fəl/ • adj. not faithful, in particular: ∎  engaging in sexual relations with a person other than one's regular partner in contravention of a previous promise or understanding: you haven't been unfaithful to him, have you? her unfaithful husband. ∎  disloyal, treacherous, or insincere: she felt that to sell the house would be unfaithful to her parents' memory.DERIVATIVES: un·faith·ful·ly adv.un·faith·ful·ness n.