Definition from macmillandictionary.com
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I wish I had someone who cared.
Only Ed cared enough to come and talk to her.
I don’t think she cares about him at all.
No one seemed to care about her feelings.
Of course I care what happens to the school!
He wasn’t lying – he genuinely didn’t care whether he passed his exams or not.
They cared passionately about the environment.
Our mother said she didn’t care either way, as long as we were all happy.
He neither knew nor cared what she meant by that remark.