(neuroanatomy) The part of the autonomic nervous system that raises blood pressure and heart rate, constricts blood vessels, and dilates the pupils when under stress.

(botany) nerved

In a nerveless manner.

The characteristic of being nervy.

comparative form of nervy: more nervy

The characteristic of being nerveless; cowardliness.

Lacking nerve: fearful; cowardly. / (biology) Lacking a nervous system. / Devoid of nerves: calm, controlled, cool under pressure.

superlative form of nervy: most nervy

(US) Having nerve; bold; brazen. / (Britain) Feeling nervous, anxious or agitated. / (archaic) Strong; sinewy. / (technical) jittery; having unwanted signal characteristics.

(simile) Extremely nervous.