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musty (adj.)

1520s, "moldy, sour," perhaps a variant of moisty "moist, damp" (see moist), but musty, of bread, "containing must" is attested mid-15c., and from 15c.-19c. must also was a variant of musk. Related: Mustiness.

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Definitions of musty from WordNet

musty (adj.)
covered with or smelling of mold;
a moldy (or musty) odor
Synonyms: moldy / mouldy
musty (adj.)
stale and unclean smelling;
Synonyms: fusty / frowsty
From wordnet.princeton.edu