Definition of musty adjective from the Oxford Advanced Learner's Dictionary

 

musty

 adjective
adjective
BrE BrE//ˈmʌsti//
 
; NAmE NAmE//ˈmʌsti//
 
(mustier, mustiest)
 
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smelling damp and unpleasant because of a lack of fresh air synonym dank a musty room a musty smell of old books These clothes smell musty. Word Origin early 16th cent.: perhaps an alteration of moisty ‘moist’.Extra examples The hallway was musty and dark. The old library smelt musty with disuse. There was a damp, musty smell in the room.
See the Oxford Advanced American Dictionary entry: musty