IPA: /ˈnɜːv.ləs.li/
KK: /ˈnɜrvəslɪ/
In a way that shows no nerves or anxiety; calmly and without fear.
She spoke nervelessly during the presentation, impressing everyone with her confidence.
Nervelessly → It is formed from "nerve" (from Latin *nervus*, meaning sinew or nerve) and the suffix "-less" (meaning without) combined with the adverbial suffix "-ly" (meaning in a manner). The word "nervelessly" means in a manner that is without nerve or strength, indicating a lack of vigor or energy.
Think of 'nerve' as representing strength or energy, and remember that 'nervelessly' means doing something without that strength.