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"

सहयोग था, जिसका नेतृत्व हमारे सबसे योग्य और साहसी लोगों

The nerveless tongue speaks in nine ways.