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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Latin ātra bīlis (“black bile”) (āter (“dark, black”) + bīlis (“bile”)) + -ous (“full of”), referring to the humour which ancient Hippocratic and later Galenic medicine associated with sadness and despondency.
bilious, dyspeptic, liverish
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Classic usage
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