Hyperexcitable refers to a state of overstimulation, excessive restlessness or agitation. Antonyms for hyperexcitable are words that describe a more calm, composed, and serene state of being. Examples of antonyms for hyperexcitable include sedate, composed, tranquil, calm, serene, placid, and relaxed. These words describe a state of being that is the opposite of overstimulation and hyperactivity. They suggest a peaceful and balanced state of mind, with a lower level of physical and emotional arousal. Opposites of hyperexcitable can be beneficial for those struggling with anxiety, stress, and other mental health problems. Learning to cultivate these states can lead to better mental health and an improved quality of life.