窮屈
きゅうくつ · kyuukutsu · JLPT N1 · na-adj
narrow
🚪 窮 (cornered, stuck) + 屈 (bend) = stuck and bent in a tight space: narrow, tight
The 窮 in 窮屈 means cornered or stuck, as in 貧窮 (poverty). 屈 means to bend. Stuck and bent together give cramped or stiff, which is also used for formal, rigid manners.