high-strung
Definitions
Very nervous, tense, or easily upset.
Characterized by a high level of nervous energy or excitability.
Examples
The high-strung racehorse became agitated as soon as it heard the starting gun.
She is a high-strung individual who finds it difficult to relax after a long day at the office.
Living in such a high-strung environment eventually took a toll on his mental health.