Definition of "highly strung" []

• Being in a tense state (adjective)

WordNet. Princeton University. 2010.

• "She wagged a reproving finger at the highly strung overbred travesty of doggy-hood."
• "Mind, I don’t really imagine for one moment that he did have anything to do with Miss Ferris’s death, but he is highly strung and rather. unbalanced and emotional."