muggy
adjective
Origin
From dialectal English mug (“fog, mist; Scotch mist”) + -y, ultimately from Old Norse mugga (“drizzle, mist”); borrowed some time before 1390, when a derived verb, Middle English mugen (“of a fog: to drizzle”), is attested.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.