Whatever!
无所谓，管他呢！

Whatever, I do not care.
无所谓，我不在乎。
I totally have no idea how to solve this problem, whatever.
我完全不知道该怎么办，随便了。
Whatever, no big deal.
管他呢，没啥事。
"Whatever!"
“管他呢！”

快快发给好友，随学随用！