1Any, anything, whatever, everything — indicating no particular limitation on what is being referred to.
なんでも好きなものを選んでください。
Please choose anything you like.
彼はなんでも食べるので、外食が楽だ。
He'll eat anything, so it's easy to go out to eat with him.
困ったことがあったら、なんでも相談してね。
If you run into any trouble, feel free to talk to me about anything.
2I hear, I'm told, apparently, they say — placed at the start of a sentence to report something heard secondhand, similar to 〜らしい or 〜ということだ.
なんでも、彼は来月転勤するらしい。
I hear he's being transferred next month.
なんでも、その店はもう閉店したそうだ。
I'm told that shop has already closed down.