M0467900 (mŭg′ē)adj.mug·gi·er, mug·gi·est Warm and extremely humid.[Probably from Middle English mugen, to drizzle; akin to Old Norse mugga, a drizzle.]mug′gi·ness n.Thesaurus
Noun
1.
mugginess - a state of warm humidityhumidity, humidness - wetness in the atmosphere