adjective, mug·gi·er, mug·gi·est.

(of the atmosphere, weather, etc.) oppressively humid; damp and close.

Origin of muggy

1725–35; mug to drizzle (noun and v.) (< Scandinavian; compare Old Norse mugga mist, drizzle) + -y1
Related formsmug·gi·ly, adverbmug·gi·ness, noun

Antonyms for muggy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for muggy

Contemporary Examples of muggy

Historical Examples of muggy

  • Sunday was a cloudy, warm day, "muggy," so Captain Zeb described it.

    Keziah Coffin

    Joseph C. Lincoln

  • It was an intensely hot, muggy night, and the mosquitoes were thick.

    The Wreck of the Titan

    Morgan Robertson

  • It was a hot, muggy, August afternoon—Wednesday in Pittsburgh.

    The Circuit Riders

    R. C. FitzPatrick

  • I have heard it complained of as being rather wet and muggy.

  • It was a damp, muggy January evening when I journeyed to this suburban retreat.

    Mystic London:

    Charles Maurice Davies

British Dictionary definitions for muggy


adjective -gier or -giest

(of weather, air, etc) unpleasantly warm and humid
Derived Formsmuggily, adverbmugginess, noun

Word Origin for muggy

C18: dialect mug drizzle, probably from Scandinavian; compare Old Norse mugga mist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for muggy

1731, from mugen "to drizzle" (late 14c.), from a Scandinavian source, cf. Old Norse mugga "drizzling mist," possibly from PIE *meug- "slimy, slippery" (see mucus).

Online Etymology Dictionary, © 2010 Douglas Harper