The word "strepitous" implies a loud or noisy behavior. Therefore, antonyms for this word would refer to quietness, gentleness or peacefulness. Some antonyms that can be used for "strepitous" include calm, silent, serene, tranquil, tranquil, quiet, still, hushed, peaceful, and placid. Quiet often describes the opposite of the noise and commotion associated with being strepitous. Serene is a good antonym as it conveys a sense of peace and calmness. Tranquil has a similar meaning to serene and can be used interchangeably. Still, hushed, and peaceful all evoke feelings of quietness and stillness. Overall, these antonyms provide a stark contrast to the boisterousness associated with being strepitous.