遅ち鈍どん

na-adjective, noun

dullness; slowness of mind; stupidity

Literary or formal term for mental slowness or dullness; not used in everyday conversation. Often implies a lack of sharpness or wit.

• 彼かれの遅ち鈍どんな反はん応のうにいらだちを覚おぼえた。

  I felt irritated by his dull-witted response.

• 遅ち鈍どんな頭ず脳のうではこの問もん題だいは解とけない。

  A slow mind cannot solve this problem.