tightly wound

chronically tense, unable to relax, highly reactive

My cat is so tightly wound he springs up off the floor if anything startles him, and he startles at the drop of a feather.

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tightly wound

Angela Martin from the Office

Dwight: "She's not the kind of person you would expect to see on Valentine's Day... She is like..."
Pam: "like tightly wound?'

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Tightly wound

Rachel.

Rachel is apparently tightly wound

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