Definition of でなくて何だろう (でなくてなんだろう)

なん

でなくて何だろう

でなくてなんだろう

denakutenandarou

expression
if not ... then what is it?, (this) is nothing other than ..., (it) must be ..., (it) is definitely ...(usually kana)(following a noun or adjective)
Related Kanji
what