难于登天 nányúdēngtiān harder than climbing to heaven Origin Definitions Defs Strokes Stroke Words Sentences Sents 难于 難於 nányú to be difficult to To be hard to do something; to find it difficult to accomplish a specific action登天 dēngtiān extremely difficult To be extremely difficult; usually used in the phrase 比登天还难 bǐdēngtiānháinán, meaning "harder than reaching heaven"