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Use "mugginess" in a sentence
"If you'll be out late, grab the heavier coat that got buried during the past week's mugginess!"
"Winds from the northwest begin to drain the mugginess out of the air with lows dipping to the 60s with maybe some upper 50s in the suburbs."
"(And yes, I worked up a sweat, just not like today!) When I found it wasn't open yet this morning, I decided to go ahead and do the workout outside despite the heat and mugginess."