Antonyms of stentorian:
thin, dead, quiet, silent, still, stilly, ultraquiet, calm, dreamy, peaceful, restful, serene, soothing, tranquil, hushed, muffled, muted, softened, toned, gentle, low, soft.
Examples of usage:
  1. " Madame, I am neither a beggar nor a vagabond," replied the old man, in stentorian tones; " my name is Picot, professor of mathematics."
    "The Lesser Bourgeoisie", Honore de Balzac.
  2. Gemmen an' ladies, took yer places," he added in a stentorian voice; " I ax yer' sideration fer bein' late, cose I had 'portant business; now, " Bow dar, scrape dar; Doan hang about de doah.
    "Taken Alive", E. P. Roe.
  3. Such a stentorian, long- winded cry!
    "Birds in the Bush", Bradford Torrey.