Etymology
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weedy (adj.)

early 15c., from weed + -y (2). In old slang, in reference to horses, "not of good blood or strength, scraggy, worthless for breeding or racing," from 1800; hence, of persons, "thin and weakly" (1852).

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Definitions of weedy

weedy (adj.)
abounding with or resembling weeds;
weedy plants that take over a garden
a weedy path
weedy (adj.)
being very thin;
Synonyms: scraggy / scraggly / boney / bony / scrawny / skinny / underweight
From wordnet.princeton.edu