also: とんじゃく
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.
彼は服装に頓着しない。
He doesn't care about his clothes.
世間の評判には頓着なく、自分の道を進んだ。
Without minding public opinion, he went his own way.