B1to think that something is important and to feel interested in it or upset about it: She's never cared very much about her appearance.[+ question word]I really don't care whether we go out or not.I don't care how much it costs, just buy it."Was Lorna happy about the arrangements?" "I don't know and I don't care."Your parents are only doing this because they care about(= love) you.Excited, interested and enthusiasticI couldn't care lessC1informal›used to emphasize rudely that you are not interested in or worried about something or someone: "Mike's really fed up about it." "I couldn't care less."Expressions meaning 'it isn't important to me'for all I careinformal›used to say that you are not interested in or worried about what someone else is doing: You can go to the match with Paula, for all I care.Lacking interest and enthusiasmUnwilling and reluctantNot showing or feeling emotionsas if I careinformal›used to say that you are not interested in or worried about something that has happened or that someone has said: He said he didn't approve of what I'd done, as if I cared.Lacking interest and enthusiasmUnwilling and reluctantNot showing or feeling emotionswho cares?B2informal›used to emphasize rudely that you do not think something is important: "It looks as if we are going to lose." "Who cares?".Expressions meaning 'it isn't important to me'