The antonyms for the word "be convulsed" are the words "calm", "tranquil", "composed", "at ease", "peaceful", "serene", "placid", and "relaxed". These words indicate an absence of violent, involuntary contractions or movements of the body, and suggest a state of tranquility and peacefulness. When we are not convulsed, we feel at ease, comfortable, and composed. Such a state enables us to think clearly, focus better, and perform our tasks efficiently. Therefore, it is essential to maintain a calm and peaceful state of mind, and use techniques such as meditation, deep breathing, and mindfulness to reduce stress and anxiety.