The term "high-strung" describes an individual who is tense or easily agitated. Antonyms, or opposite words, of "high-strung" might include calm, relaxed, serene, or composed. These words imply a state of peace, and suggest an individual who is not easily flustered. A person who is not high-strung might be described as easy-going, laid-back, or even carefree. They may possess a more casual demeanor, and likely do not experience high levels of stress or anxiety. Antonyms of "high-strung" offer a range of vocabulary and demonstrate the balance we can bring to our emotional lives by being calm and collected.