Primary Fibromyalgia is a medical condition characterized by chronic pain, stiffness, and tenderness in the muscles, joints, and other connective tissues. The term "primary" indicates that the cause of the condition is unknown. However, antonyms for primary Fibromyalgia would include secondary Fibromyalgia, which is caused by an underlying medical condition or injury, such as arthritis or a traumatic event. Another antonym could be remission, as some individuals may experience periods of relief from the symptoms of Fibromyalgia. Additionally, a cure would be a direct antonym, as no medical cure currently exists for Fibromyalgia.