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"
composed serenely self-possessed and free from agitation especially in times of stress; "the performer seemed completely composed as she stepped onto the stage"; "I felt calm and more composed than I had in a long time"
nerveless -
lacking strength; "a weak, nerveless fool, devoid of energy and promptitude"- Nathaniel Hawthorne
