难解的

• unintelligible
• impalpable
• cramp
• mysterious
• enigmatical
• abstruse
• labyrinthian
• holocryptic
• obscure
• subtle
• recondite
• crabbed
• unfathomable
• bottomless

例句

1. 心肌病一种心肌疾病，尤指病因未知或难解的心肌疾病
   A disease or disorder of the heart muscle, especially of unknown or obscure cause.
2. 他的诗作有很多晦涩难解的地方。
   His poems are full of obscurities.
3. 这对他们来说真是一个难解的问题。
   This problem is too difficult for them to settle.