nerveless
[adjective]
Synonyms: calm, composed, controlled, cool, impassive, imperturbable, self-possessed, unemotional

[TahlilGaran] English Synonym Dictionary ▲

nerve‧less /ˈnɜːvləs $ ˈnɜːrv-/ adjective written
[Word Family: adjective: nervous, nerveless, nerve-racking, nervy, unnerving; noun: nerve, nerves, nervousness; verb: nerve, unnerve; adverb: nervously]
used to describe someone’s fingers when they cannot hold something firmly, especially because they have had a shock:
The key fell from her suddenly nerveless fingers.

[TahlilGaran] Dictionary of Contemporary English ▲