couldn't care less

کاملا بی توجه

I couldn't care less
واسم مهم نیست - برام اهمیتی نداره

Used to say, often rudely , that you don't think sth or sb is important or worth worring about syn don't give a damn.

To not care at all

ذره ای اهمیت نداره، کوچکترین اهمیتی نداره