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

 

muggy

 adjective
adjective
BrE BrE//ˈmʌɡi//
 
; NAmE NAmE//ˈmʌɡi//
 
 
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(of weather) warm and damp in an unpleasant way synonym close2 a muggy August day Word Origin mid 18th cent.: from dialect mug ‘mist, drizzle’, from Old Norse mugga.
See the Oxford Advanced American Dictionary entry: muggy