Being high strung is often perceived as being anxious or nervous. However, there are several synonyms that can describe this state of mind. "Tense" or "edgy" are commonly used to suggest somebody is feeling on edge or easily agitated. "Jittery", "wired", or "shaky" might describe someone who feels like they've had too much caffeine. "Overwhelmed" or "panicky" suggest a feeling of being swamped or trapped in a stressful situation. By using these synonyms, we can be more nuanced and accurate when describing someone who is high strung, and better appreciate the complex emotions that lead to this state of mind.