頭の回転が遅い あたまのかいてんがおそい Also written 頭の回転が鈍い Meanings Expression, い-adjective slow-witted; dull; slow on the uptake See also: 頭の回転 (あたまのかいてん). Kanji 頭 head. Read as あたま. 回 times. Read as カイ. 転 turn. Read as テン. 遅 late. Read as おそい. Jinuma: Japanese Dictionary · Word lists