頓とん着ちゃく

noun, noun or participle which takes 'suru', intransitive verb

mind; care about; be concerned with

Almost always used in negative constructions like 頓着しない or 頓着なく, meaning 'not to care about' or 'to be indifferent to'. Often followed by ～しない, ～なく, or ～せず.

• 彼かれは服ふく装そうに頓とん着ちゃくしない。

  He doesn't care about his clothes.

• 世せ間けんの評ひょう判ばんには頓とん着ちゃくなく、自じ分ぶんの道みちを進すすんだ。

  Without minding public opinion, he went his own way.