[bil.ious] adj [MF bilieux, fr. L biliosus, fr. bilis] (1541) 1 a: of or relating to bile b: marked by or suffering from liver dysfunction and esp. excessive secretion of bile c: appearing as if affected by a bilious disorder
2: of or indicative of a peevish ill-natured disposition -- bil.ious.ly adv -- bil.ious.ness n