Antonyms for the word "most earsplitting" would be words that describe the opposite of loud and jarring noises. These words could include soft, quiet, muffled, gentle, subdued, or faint. For example, a whisper would be considered an antonym for most earsplitting. Other antonyms might be peaceful, tranquil, or comforting, like the sound of a gentle stream or a lullaby. Antonyms for most earsplitting could also include words that describe harmonious or melodic sounds, such as pleasing, sweet, or melodious. The choice of antonym depends on the context and function of the word in a given sentence or phrase.