- The definition of muggy is hot, humid, sticky weather.
A 90 degree day with 90 percent humidity is an example of a muggy day.
muggy definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- mugginess noun
muggy definition by American Heritage Dictionary
adjective mug·gi·er, mug·gi·est
Warm and extremely humid.
Origin: Probably from Middle English mugen, to drizzle; akin to Old Norse mugga, a drizzle.
- mugˈgi·ness noun