1. Adverb (fukushi)

   all sorts of things; (anything and) everything

   Usually written using kana alone

   聞いた事をなんでもかんでも信じてはいけない。

2. by all means; at any cost

   Usually written using kana alone

Also written 何でも彼んでも【なんでもかんでも】nandemokandemo