1. graded adjective & adjective 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 British] ⇒ Sometimes dad was nice to us, but sometimes he was bad-tempered and nervy. ⇒ Alan was irritable, and very evidently in a nervy state. 2. graded adjective & adjective If you say that someone is nervy, you mean that their behaviour is bold or daring. [US] ⇒ John liked him because he was a nervy guy and would go out and shoot anybody who John wanted him to shoot.
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