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Adjective: nerveless  nurv-lus
  1. Marked by calm self-control (especially in trying circumstances); unemotional
    "the most nerveless winner in the history of the tournament";
    - cool, coolheaded
  2. Lacking strength
    "a weak, nerveless fool, devoid of energy and promptitude";
    - feeble

See also: composed, powerless

Encyclopedia: Nerveless