Hyper-active is often used to describe someone who is extremely active, restless, and high-spirited. However, there are several antonyms or opposite words that can be used to describe an individual who is calm, peaceful and less active. Some of the antonyms that can be used for hyper-active include sedate, peaceful, placid, calm, quiet, serene, still, composed, and relaxed. These words describe someone who is not overly active, but rather has a mellow demeanor and is in control of their emotions. By using these antonyms to describe individuals, we can better express their personalities and characteristics in a more nuanced way.