深不可测的，无底的深度上象深渊的；深不可测的 Resembling an abyss in depth; unfathomable.
他已陷入绝望的深渊。 He has been in the abyss of despair.
我一生，就像沉在一个无底的深渊，一直在把一车车的见闻，倒进那个我称之为精神的遗忘之空虚里去。 All my life, as down an abyss without a bottom, I have been pouring vanloads of information into that vacancy of oblivion I call my mind.
