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}.