nervous in WordNet English dictionary

1. excited in anticipation
   aflutter  nervous 
   
2. causing or fraught with or showing anxiety
   "spent an anxious night waiting for the test results"; "cast anxious glances behind her"; "those nervous moments before takeoff"; "an unquiet mind"
   anxious  nervous  queasy  uneasy  unquiet 
   
3. unpredictably excitable (especially of horses)
   skittish  flighty  spooky  nervous 
   
4. of or relating to the nervous system
   "nervous disease"; "neural disorder"
   nervous  neural 
   
5. easily agitated
   "a nervous addict"; "a nervous thoroughbred"
   nervous