Nervous

Examples of usage:

1. " But you're on the ground now, Lem," said Columbine, with a nervous laugh.
   "The Mysterious Rider", Zane Grey.
2. Mentally she complained of being nervous and easily awakened at night; consciousness was clear; she was well oriented; no hallucinations or delusions could be elicited.
   "Studies in Forensic Psychiatry", Bernard Glueck.
3. Don't stand there and watch me, please; you make me nervous.
   "Brother and Sister", Josephine Lawrence.