stuffy

The room felt very stuffy because the heater was on and the windows were closed.

(Chinese) 因为暖气开着且窗户关着，房间里感觉非常闷热。

She found the club's atmosphere a bit too stuffy and formal for her liking.

(Chinese) 她觉得这家俱乐部的气氛有点太死板正式了，她不喜欢。