muggy
Concise Oxford English Dictionary © 2008 Oxford University Press:
muggy/ˈmʌɡi/
▶adjective (muggier, muggiest) (of the weather) unpleasantly warm and humid.
– derivatives
mugginess noun.
mugginess noun.
– origin C18: from dial. mug ‘mist’, from ON mugga.
'muggy' also found in these Oxford entries:

