IPA: /ˈnɜːv.ləs/
KK: /ˈnɜrv.ləs/
Not showing any emotion or strength, especially in difficult situations; calm and controlled or lacking courage and energy.
Despite the chaos around her, she remained nerveless and composed.
Nerveless → It is formed from "nerve" (from Latin "nervus", meaning sinew or nerve) and "-less" (meaning without). The word "nerveless" means without nerve or strength, often implying a lack of energy or vitality.
Think of being 'without' ('-less') strength or energy, as if you have no 'nerve' to act.