"Highwrought" is an adjective used to describe a tense, agitated, and overexcited state. The antonyms for this word can include calm, relaxed, composed, tranquil, and peaceful. These words signify a sense of balance, poise, and stability, which are opposite to the erratic and frenzied state associated with "highwrought." Other antonyms could be collected, level-headed, untroubled, or cool-headed, as they all describe someone who reacts to situations with a sense of control and rationality. It is essential to understand that the choice of antonym may depend on the context in which the word "highwrought" is used in a particular sentence or situation.