Hyperkinetic refers to excessive motion or activity. Antonyms for hyperkinetic would be words describing individuals who exhibit less motion or activity. Some possible antonyms for hyperkinetic include calm, tranquil, placid, relaxed, and composed. These words convey a sense of peacefulness and stillness, in contrast to the hyperactivity and restlessness associated with hyperkinetic behavior. Other antonyms for hyperkinetic could include slow, sluggish, lethargic, torpid, and inactive. These words convey a sense of sluggishness or decreased energy, in contrast to the high levels of activity associated with hyperkinetic behavior. Overall, antonyms for hyperkinetic emphasize a sense of stillness or reduced activity levels.