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

1.
tidak peduli langsung, tidak kisah
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 kereta barunya, tetapi saya tidak peduli langsung.
•
Whether they come or not, I couldn't care less.
Sama ada mereka datang atau tidak, saya tidak peduli langsung.