Japanese by Example
Learning through examples in manga

Lack of interest with 知ったことか

Grammar: Unsorted » 知ったことか

The expression 知ったことか implies a lack of interest in a thing.

“I have nothing to do with it.”

Examples

Don't care if it troubles you with 知ったことか

三ツ星カラーズ » Volume 1 » Page 138

Oyaji presented Colors with a bomb to defuse via a riddle, which led to problems for Saitou. After Colors successfully defuses the bomb, Saitou tells Oyaji to stop playing bothersome games.

おやじ:
子供(こども)のためだ。お(まえ)迷惑(めいわく)(かうむ)ろうと()ったことか
“It's for the kids. I don't care if it will cause you trouble.”

Nothing to do with Ayumu's situation with 知ったことか

それでも歩は寄せてくる » Volume 2 » Page 97

Sakurako tells Takeru not to go to the shogi club as he’ll get in the way of Ayumu being with Urushi. However, as a new member of shogi club, and as a man, Takeru feels it’s his duty to show up.

タケル:
(あゆむ)事情(じじょう)など()ったことか
This has nothing to do with Ayumu's situation.”