Strepitous means characterized by loud, noisy or clamorous sounds. The antonyms for the word 'more strepitous' would be peaceful, tranquil, quiet, noiseless, silent, calm or serene, in other words, anything that doesn't create noise or disturbance. A serene environment is one that's free of noise or disturbance, characterized by calmness and absence of noise. On the other hand, doing something quietly means doing it without raising the sound unnecessarily. Thus, antonyms for 'more strepitous' describe an environment that's peaceful, calming, and quite opposite to anything described as noise-inducing or clamorous. In conclusion, using antonyms for 'more strepitous' is a way of describing something that's peaceful and calm, without noise.