1 adj If someone is nervy, their behaviour shows that they are very tense or anxious, or they are the type of person who is easily upset.
(mainly BRIT)
(=jumpy)
Alan was irritable, and very evidently in a nervy state.
2 adj If you say that someone is nervy, you mean that their behaviour is bold or daring.
(AM)
John liked him because he was a nervy guy and would go out and shoot anybody who John wanted him to shoot.