unfathomable

形容词 unfathomable:

1. of depth; not capable of being sounded or measured
2. so deep as to be unmeasurable
   同义词：abysmal, abyssal
3. impossible to come to understand

1. An unfathomable chasm; a yawning gulf.
   深渊，无底洞深不可测的裂缝; 张开的深壑
2. Resembling an abyss in depth; unfathomable.
   深不可测的，无底的深度上象深渊的; 深不可测的