ashamed

Synonyms: abashed apologetic bashful blushing chagrined compunctious conscience-stricken contrite crestfallen debased demeaned discomfited disconcerted distraught distressed embarrassed flustered guilty hesitant humble humbled humiliated meek mortified muddled penitent regretful reluctant repentant shamed shamefaced sheepish shy sorry stammering stuttering submissive

Antonyms: bold defiant immodest not sorry shameless unregretful unremorseful unself-conscious