nervous -- (easily agitated; "a nervous addict"; "a nervous thoroughbred")
anxious, nervous, queasy, uneasy, unquiet -- (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")
nervous, neural -- (of or relating to the nervous system; "nervous disease"; "neural disorder")