insouciant
01
無頓着な, 気にしない
having an unconcerned attitude, especially in situations where others might feel worried
例
His insouciant attitude toward his homework made it clear he was n’t worried about grades.
宿題に対する彼の無頓着な態度は、成績を気にしていないことを明らかにしていた。
With an insouciant wave, he dismissed the idea as if it were of no importance at all.
無頓着な手振りで、彼はその考えをまるで重要でないかのように退けた。
