Hiçbir şeyi umursamaz. - He doesn't care about anything.
Hiçbir şeyi umursamaz.
He doesn't care about anything.
Onun bizi umursamadığı belli. - It's obvious that she doesn't care about us.
Onun bizi umursamadığı belli.
It's obvious that she doesn't care about us.
... But for normal users who don't care about that level of ...
... a topic or interest you care about. ...