nervous

adjective

1. easily agitated or alarmed.

- a nervous addict

- a nervous thoroughbred

Similar word(s): tense

2. causing or fraught with or showing anxiety

- those nervous moments before takeoff

Similar word(s): troubled, anxious, queasy, uneasy, unquiet

3. of or relating to the nervous system

- nervous disease

Similar word(s): neural

4. excited in anticipation

Similar word(s): excited, aflutter

5. unpredictably excitable (especially of horses)

Similar word(s): excitable, flighty, skittish, spooky