bitter grief or anger.

Gall; figurative bitterness. Obsolete.

figurative. Something persistently or increasingly harmful or painful; a corroding or corrupting influence.

Bitterness, gall; a source of bitterness.

figurative referring to its bitterness.

Something which rankles; a rankling thought or feeling. Also as a mass noun: rankling, bitterness.

The quality or state of being bitter. animosity, acrimony of temper, action, or words.