I couldn't care less
US /aɪ ˈkʊdnt kɛr lɛs/
UK /aɪ ˈkʊdnt kɛr lɛs/

1.
tidak peduli sama sekali, masa bodoh
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.
Dia mengeluh tentang mobil barunya, tapi aku tidak peduli sama sekali.
•
Whether they come or not, I couldn't care less.
Apakah mereka datang atau tidak, aku tidak peduli sama sekali.