Source : Webster's Revised Unabridged Dictionary (1913)

Atrabilious \At`ra*bil"ious\, a.
   Melancholic or hypochondriac; atrabiliary. --Dunglision.

         A hard-faced, atrabilious, earnest-eyed race. --Lowell.

         He was constitutionally atrabilious and scornful.
                                                  --Froude.

Source : WordNet®

atrabilious
     adj : irritable as if suffering from indigestion [syn: {bilious},
           {dyspeptic}, {liverish}]