NERVELESS
cool, coolheaded, nerveless
(adjective) 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”
feeble, nerveless
(adjective) lacking strength; “a weak, nerveless fool, devoid of energy and promptitude”- Nathaniel Hawthorne
Source: WordNet® 3.1
Etymology
Adjective
nerveless (comparative more nerveless, superlative most nerveless)
Lacking nerve: fearful; cowardly.
(biology) Lacking a nervous system.
Devoid of nerves: calm, controlled, cool under pressure.
Source: Wiktionary
Nerve"less, a.
1. Destitute of nerves.
2. Destitute of strength or of courage; wanting vigor; weak;
powerless.
A kingless people for a nerveless state. Byron.
Awaking, all nerveless, from an ugly dream. Hawthorne.
Source: Webster’s Unabridged Dictionary 1913 Edition