- Suffering from real or supposed liver disorder, thus making one ill-natured.
- Of or pertaining to something containing or consisting of bile.
- irritable, Irritable or bad tempered: irascible.
Etymology: From bile, from Latin bilis, + adjective suffix -ous, "full of", from Latin adjective suffix -osus, "full of".
- The students had learned not to ask questions of the bilious professor.
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Full Definition of bilious