adjective, mug·gi·er, mug·gi·est. (of the atmosphere, weather, etc.) oppressively humid; damp and close.

What is the meaning of Mugginess?

: being very warm and humid muggy weather. Other Words from muggy. mugginess noun.

What does the word airless mean?

adjective. lacking air. that is without fresh air; stuffy: a dark, airless hallway. that is without a breeze; still: an airless July day.