mun-mun
Oppressively hot and humid with stagnant air. Can also describe a place charged with excitement or tension.
💡A packed concert venue in summer — 'The hall was mun-mun with heat and body odor.'
締め切った部屋がむんむんと暑い。
The closed-up room is mun-mun hot and stuffy.
The gym was ___ with heat after the basketball game.
バスケの試合の後、体育館は○○と暑かった。