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

1725–35; mug to drizzle (noun and v.) (< Scandinavian; compare Old Norse mugga mist, drizzle) + -y1

muggily, adverb
mugginess, noun

dry. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
muggy (ˈmʌɡɪ)
adj , -gier, -giest
(of weather, air, etc) unpleasantly warm and humid
[C18: dialect mug drizzle, probably from Scandinavian; compare Old Norse mugga mist]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1731, from mugen "to drizzle" (late 14c.), from O.N. mugga "drizzle, mist," related to mjukr "soft," or O.N. mygla "mold," which is cognate with L. mucus "snot."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Muggy-Colloquially descriptive of warm and especially humid weather.
Humid or muggy conditions can add to the discomfort of high temperatures.
In the muggy heat, he's rolled up the sleeves of his white dress shirt.
Even though the sun had set hours ago, the air was still oppressively muggy,
  and my clothes immediately began sticking to my skin.
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