couldn't care less

Verb

idiomatic

(idiomatic) to not care at all; to have no interest or concern; to be apathetic.

Japanese Meaning

全く気にしない / 全く興味がない / 無関心である

She couldn't care less what people think about her fashion choices.

彼女は自分のファッションについて人々がどう思うかをまったく気にしていない。

Sense（1）

(idiomatic) to not care at all; to have no interest or concern; to be apathetic.

I used to be so careless / As if I couldn't care less

couldn't have cared less

（ past ）