/ Dictionary / Index M muggy: Meaning and Definition of Find definitions for: mug•gy Pronunciation: (mug'ē), [key] — -gi•er, -gi•est. (of the atmosphere, weather, etc.) oppressively humid; damp and close. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: muggy (Thesaurus) muggins Mughal Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language