Etymology
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frowsty (adj.)

"having an unpleasant smell," 1865, of unknown origin; perhaps related to Old French frouste "ruinous, decayed," or to Old English þroh "rancid;" both of which also are of uncertain origin. Also compare frowzy.

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Definitions of frowsty

frowsty (adj.)
stale and unclean smelling;
Synonyms: fusty / musty
From wordnet.princeton.edu