Noun
The condition or quality of being muggy.
Source: Webster's dictionaryThe heat and humidity will crank over the mid-Atlantic and the Northeast this weekend and early next week, resulting in oppressive mugginess and heat indices that top out at as high as 105—110 degrees Fahrenheit. Source: Internet
It was another hot night, the mugginess unfazed by the air-conditioning unit lodged in the window, and here we were glued together by sweat and spit-up and dog hair. Source: Internet