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