undecipherable [ˌʌndɪ'saɪfərəbəl]

例句:

• A hopelessly undecipherable jumble of overlapping names.
  一大团无法分辨、层层叠叠的名字.
  
• A typically Irish face was made wise and calm and undecipherable by much experience.
  一张典型的爱尔兰面孔,因为久经风霜而变得聪明、镇静、捉摸不定.
  
• I would say that consciousness is equally undecipherable if not more so.
  来自SA