Synonyms for apologetic

contrite, remorseful, sorry, penitent, repentant, regretful, supplicating, retracting, self-effacing, self-reproachful, self-condemnatory, self-incriminating, explanatory, extenuating, atoning, expiatory, rueful, expressing regret, regretfully acknowledging, compunctious, penitential, propitiatory, conciliatory, conscience-stricken, down on one's knees*.

Antonyms stubborn, unrepentant, unregenerate.