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難題 / なんだい : n 1）difficult problem 2）challenge P
難航 / なんこう : n vs 1 1）difficult voyage 2）hard flight 2 3）rough going 4）rough passage 5）running into trouble 6）stormy passage P
難文 / なんぶん : n 1）difficult sentence
難易 / なんい : n 1）difficulty 2）relative difficulty P
難曲 / なんきょく : n 1）difficult musical piece
難民 / なんみん : n 1）refugees P
難治 / なんじ / なんち : n adj-no 1 1）intractable (diseases) 2）hard to cure 2 3）rebellious 4）insurgent 5）refractory 6）obstinate
難渋 / なんじゅう : adj-na n 1）retardation
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難題

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