頭あたまの回かい転てんが遅おそい

expression, i-adjective

slow-witted; dull; slow on the uptake

Describes someone who is mentally slow, not quick to understand or react. Often used critically or self-deprecatingly.

See also: 頭の回転 (あたまのかいてん)

• 彼かれは頭あたまの回かい転てんが遅おそいから、説せつ明めいに時じ間かんがかかる。

  He's slow on the uptake, so explanations take time.