nerveless

形容词 nerveless:

1. marked by calm self-control (especially in trying circumstances); unemotional
   同义词：cool, coolheaded
2. lacking strength- Nathaniel Hawthorne
   同义词：feeble

1. The knife fell from her nerveless fingers.
   刀子从她那无力的手中落下。

nerve.less

adj.（形容词）
Lacking strength or energy; spiritless; weak.
无力的：无力或无精力；无精打彩的；虚弱
Lacking courage; spineless or cowardly.
无勇气的：缺乏勇气的；懦弱的或胆小的
Calm and controlled in trying circumstances; cool.
冷静的：在逆境中平静且能自控；冷静的

【引伸】
nerve.lessly
adv.（副词）
nerve.lessness
n.（名词）