なのだ Common word LinksSentence search for なのだSentence search for なんだEdit in JMdict Auxiliary1. it is assuredly that ...; can say with confidence that ...See also のだAuxiliary2. did not ...Kansai dialect, Only applies to なんだ, after the -nai stem of a verbOther formsなんだ Discussions Log in to talk about this word.