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poorly (adv.)

early 13c., poureliche, "inadequately, badly, insufficiently," from poor (adj.) + -ly (2). Modern form from 15c. Meaning "in poverty" is from mid-14c. Meaning "indisposed, in somewhat ill health" is from 1750.

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Definitions of poorly from WordNet
1
poorly (adv.)
(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well;
the team played poorly
Synonyms: ill / badly
2
poorly (adj.)
somewhat ill or prone to illness;
feeling poorly
Synonyms: ailing / indisposed / peaked / sickly / unwell / under the weather / seedy
From wordnet.princeton.edu