nerveless

Adjective Satellite

• marked by calm self-control (especially in trying circumstances); unemotional
  • "the most nerveless winner in the history of the tournament"
• lacking strength; - Nathaniel Hawthorne
  • "a weak, nerveless fool, devoid of energy and promptitude"

Adj

• Lacking nerve: fearful; cowardly.
• Lacking a nervous system.
• Devoid of nerves: calm, controlled, cool under pressure.

Synonyms

cool, coolheaded, feeble