Etymology
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fusty (adj.)

"stale-smelling," late 14c., from French fusté "fusty, tasting of the cask," from Old French fuste, fuist "wine cask," originally "stick, stave, wood" (Modern French fût), from Latin fustis "staff, stick of wood" (see fustigate). Related: Fustiness. Fustilugs was 17c. slang for "a woman of gross or corpulent habit" [OED], later generally in dialect for a big-boned person.

updated on January 27, 2015

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Definitions of fusty from WordNet

fusty (adj.)
old-fashioned and out of date;
Synonyms: standpat / unprogressive / nonprogressive
fusty (adj.)
stale and unclean smelling;
Synonyms: musty / frowsty
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.