what does it matter
01
どうでもいい, 何が問題なのか
used to convey indifference, resignation, or a lack of concern regarding a particular issue
例
You forgot to bring your umbrella? What does it matter, it's not raining yet.
傘を持ってくるのを忘れたの？どうでもいいよ, まだ雨は降っていないから。
