Vocab InfoA13 Noun, の-adjective難攻(なんこう)不落(ふらく)impregnableDetailsExamples難攻不落impregnableDetailsExamplesDictionary DefinitionNoun, の-adjective1. impregnableYojijukugoAll Forms難攻不落 【なんこうふらく】DetailsPitch AccentなんこうふらくExamplesThere are no sentences available for this contentHold tight, context sentences are coming soon!Self-Study SentencesStudy your own way!Add sentences and study them alongside Bunpro sentences.Try Bunpro