Agitation (feeling jittery).

激越(感到战战兢兢)。

youdao

More negatives include feeling jittery when you drink too much coffee and withdrawal symptoms like headaches if you choose to stop drinking.

负面影响还有：咖啡喝多后会焦躁不安，不喝时会有头痛的戒断症状。

youdao

Plus it energizes you without the jittery feeling coffee or energy drinks can give.

除此，它还可以使你充满活力，并且没有其它咖啡或能量饮料带来的紧张不安。

youdao

Her evidence has certainly left some in Cardiff Bay feeling "pretty jittery" a reliable source tells me.

BBC: Dogs, ducks and ethics