Having a harsh taste, like that of wormwood or quinine.Hence Unpalatable; hard to swallow, literally or figuratively: as, a bitter pill; a bitter lesson.Hard to be borne; grievous; distressful; calamitous: as, a bitter moment; bitter fate.Causing pain or smart to the sense of feeling; piercing: painful; biting: as, bitter cold; “the bitter blast,”Harsh, as words; reproachful; sarcastic; cutting; sharp: as,“bitter taunts,”Cherishing or exhibiting animosity, hate, anger, or severity; cruel; severe; harsh; stern: as, “bitterest enmity,” Shak., Cor., iv. 4; “bitter enemies,”Evincing or betokening intense pain or suffering: as, a bitter cry.n. That which is bitter; bitterness.n. Specifically A bitter medicine, as a bitter bark or root, or an infusion made from it. See bitters.To make bitter; give a bitter taste to; embitter.n. Nautical, a turn of a cable round the bitts.n. An old form of bittern.