難解 [ㄋㄢˊ ㄐㄧㄝˇ; nan2 jie3]
  hard to solve
  hard to dispel
  hard to understand
  hard to undo
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  難解
  なんかい
  adjectival nouns or quasi-adjectives (keiyodoshi)
  noun (common) (futsuumeishi)
  difficult to understand
  unintelligible
  abstruse
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