Of words (or the person who utters them): Stinging, cutting, harsh, keenly or cruelly reproachful, virulent.

Full of malignity; given to cherish anger or resentment.

Full of bitterness; spiteful, malicious.

Resentful, bitter, irascible; stubborn, obstinate.

Full of gall; bitter, malignant.

steeped in gall or bitterness.

figurative. Violently bitter, spiteful, or malignant; full of acrimony or enmity. Of action or feeling.

Resentful, angry, malignant.

Of an action, event, etc.: proceeding from, or characterized by, rancour.

Having the nature of gall.

figurative. Of language, persons, etc.: Extremely sharp, caustic, or scathing; bitterly ill-natured or malignant.