The phrase "were convulsed" conveys a sense of intense shaking or uncontrollable tremors. Its antonyms include calm, settled, serene, tranquil, and composed. These words indicate a state of peacefulness or stability. Alternatively, other antonyms might indicate a more subdued form of movement, such as sway, rock, or gently shift. These words imply a gentle or controlled action, rather than the violent tremors of convulsions. Overall, the antonyms for "were convulsed" suggest a sense of security and stillness, in contrast to the chaotic movement that the original phrase conveys.