(1):

(v. t.) Characterized by sharpness, severity, or cruelty; harsh; stern; virulent; as, bitter reproach.

(2):

(v. t.) Mournful; sad; distressing; painful; pitiable.

(3):

(n.) Any substance that is bitter. See Bitters.

(4):

(v. t.) To make bitter.

(5):

(v. t.) Causing, or fitted to cause, pain or distress to the mind; calamitous; poignant.

(6):

(v. t.) Having a peculiar, acrid, biting taste, like that of wormwood or an infusion of hops; as, a bitter medicine; bitter as aloes.

(7):

(v. t.) Causing pain or smart; piercing; painful; sharp; severe; as, a bitter cold day.

(8):

(n.) AA turn of the cable which is round the bitts.