3 sentences for 闷 (mèn)

1. 他整天关在家里，觉得很闷。

   tā zhěng​tiān guān zài jiā​lǐ, jué​de hěn mèn.

   He stays cooped up at home all day and feels very bored.

   Source: Dong Chinese Dictionary

2. 心里闷得慌。

   xīn lǐ mèn de huāng.

   I feel very stifled and uneasy inside.

   Source: Dong Chinese Dictionary

3. 由于窗户全都关着，屋子里感觉特别闷。

   yóu​yú chuāng​hu quán dōu guān zhe, wū​zi lǐ gǎn​jué tè​bié mèn.

   Since all the windows are closed, the room feels particularly stuffy.

   Source: Dong Chinese Dictionary