Adjective: unnerved ,ún'nurvd
- Deprived of courage and strength
"the steeplejack, exhausted and unnerved, couldn't hold on to his dangerous perch much longer"
- Disturb the composure of
"Good, it shouldn't unnerve him at all";
- faze, enervate, unsettle, rattle [informal]
See also: afeard [archaic], afeared [archaic], afraid, 'fraid [non-standard]
Type of: discomfit, discompose, disconcert, untune [rare], upset