excruciating

动词 excruciate:

1. torment emotionally or mentally
   同义词：torment, torture, excruciate, rack
2. subject to torture
   同义词：torture, excruciate, torment

形容词 excruciating:

1. extremely painful
   同义词：agonizing, agonising, harrowing, torturing, torturous, torturesome

1. He has excruciating backache.
   他的背疼得很厉害。

ex.cru.ci.at.ing

adj.（形容词）
Intensely painful; agonizing.
使苦恼的：使人极痛苦的；烦恼的
Very intense or extreme:
极度地：非常强烈的或极度的：
例句：
wrote with excruciating precision.
高度精确地写出

【引伸】
excru.ciat.ingly
adv.（副词）