Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
atrabilious is an adjective meaning "irritable as if suffering from indigestion". It carries one recorded sense.
irritable as if suffering from indigestion
Definitions, synonyms and semantic relations for atrabilious come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.