compunctious

feeling sorrow for a wrong that one has done he appeared not the least bit compunctious about ditching his date at the bar and walking off with the woman he had just met Synonyms apologetic, contrite, penitent, regretful, remorseful, repentant, rueful, sorryRelated Words ashamed, shamefaced, sheepish; dolorous, grieving, lugubrious, mournful, plaintive, sorrowful, wailing, weeping, woefulNear Antonyms compassionless, cruel, merciless, pitiless, ruthless, unmerciful; shameless, unashamedAntonyms impenitent, remorseless, unapologetic, unrepentant