I couldn't care less

US /aɪ ˈkʊdnt kɛr lɛs/
UK /aɪ ˈkʊdnt kɛr lɛs/
"I couldn't care less" picture
1.

no me importa en absoluto, me da igual

used to express that one does not care at all about something

:
He was complaining about his new car, but I couldn't care less.
Se quejaba de su coche nuevo, pero a mí no me importaba en absoluto.
Whether they come or not, I couldn't care less.
Vengan o no, a mí no me importa en absoluto.