1. (n.) The bile; -- formerly supposed to be the seat and cause of irascibility.

2. (n.) Irritation of the passions; anger; wrath.

acerbity acid acidity acidulousness acrimony anger animosity asperity bad humor bad temper bile biliousness bitter resentment bitterness bitterness of spirit causticity corrosiveness discontent gall gnashing of teeth hard feelings heartburning ill humor ill nature ill temper rancor rankling slow burn soreness sourness spleen virulence