Adjective nerveless has 2 senses
  1. cool, coolheaded, nerveless - marked by calm self-control (especially in trying circumstances); unemotional; "play it cool"; "keep cool"; "stayed coolheaded in the crisis"; "the most nerveless winner in the history of the tournament"
    Antonym: discomposed (indirect, via composed)
  2. feeble, nerveless - lacking strength; "a weak, nerveless fool, devoid of energy and promptitude"- Nathaniel Hawthorne
    Antonym: powerful (indirect, via powerless)
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