Source : Webster's Revised Unabridged Dictionary (1913)

Bilious \Bil"ious\ (b[i^]l"y[u^]s), a. [L. biliosus, fr. bilis
   bile.]
   1. Of or pertaining to the bile.

   2. Disordered in respect to the bile; troubled with an excess
      of bile; as, a bilious patient; dependent on, or
      characterized by, an excess of bile; as, bilious symptoms.

   3. Choleric; passionate; ill tempered. ``A bilious old
      nabob.'' --Macaulay.

   {Bilious temperament}. See {Temperament}.

Source : WordNet®

bilious
     adj 1: relating to or containing bile [syn: {biliary}]
     2: suffering from or suggesting a liver disorder or gastric
        distress [syn: {liverish}, {livery}]
     3: irritable as if suffering from indigestion [syn: {atrabilious},
         {dyspeptic}, {liverish}]