Heavings are involuntary movements caused by breathing heavily or exercising vigorously. The antonyms for heavings are stillness, calmness, and quietness. When one is in a state of stillness, their body remains motionless, and their breathing is slow and steady. Calmness is a state of being relaxed and composed, characterized by a peaceful mind and a slow heart rate. Quietness, on the other hand, refers to the absence of noise and disturbance in one's environment. These antonyms suggest a sense of peace, tranquility, and stability, as opposed to the nervousness and agitation associated with heavings.