( informal ) used to say, often rudely, that you do not think that sb/sth is important or worth worrying about :
Quite honestly, I couldn't care less what they do.
( informal ) used to say, often rudely, that you do not think that sb/sth is important or worth worrying about :
Quite honestly, I couldn't care less what they do.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005