"Young Lord Douglas, most powerful of all the Scottish barons, was headstrong and impetuous, and like most Norman lords, choleric when he fancied himself crossed."
Lord of Samarcand
a. Extremely irritable or easily angered; irascible: a choleric disposition.
b. Archaic Having choler as the dominant humor in terms of medieval physiology.
2. Showing or expressing anger: choleric remarks.
b. causing biliousness.
[1300–50; Middle English < Medieval Latin colericus bilious, Latin cholericus < Greek cholerikós. See cholera, -ic]
chol′er·i·cal·ly, chol′er·ic·ly adv.
For more information on the Four Humors: