From Longman Dictionary of Contemporary Englishhighly strunghighly strungespecially British English, high-strung American English nervous and easily upset or excited a highly strung child → highly
Examples from the Corpus
highly strung• They were all very highly strung and eventually, they did break up.• But she had to leave because she was a bit highly strung; and of course you know Virginia herself was.• Being nervous, highly strung or liable to sudden anger and 2.• I think he is just an ill and shocked young man with the highly strung temperament of so many artistic people.• Sandra was a dealer lacking in professional experience, who had a highly strung temperament.• Because of his fine pedigree he was a little bit more highly strung than the others and would set off rather sharply.• For one thing, Nijinsky started life so excitable and highly strung that O'Brien warned his owner he might not be trainable.• Paul was highly strung, working too hard. 