The Collaborative International Dictionary of English v.0.48:
Atrabilious \At`ra*bil"ious\, a. Melancholic or hypochondriac; atrabiliary. --Dunglision. [1913 Webster] A hard-faced, atrabilious, earnest-eyed race. --Lowell. [1913 Webster] He was constitutionally atrabilious and scornful. --Froude. [1913 Webster]WordNet (r) 3.0 (2006):
atrabilious adj 1: irritable as if suffering from indigestion [syn: atrabilious, bilious, dyspeptic, liverish]