muttering, whispering, mumbling, hushed, sighing, wailing, moans, chorused, shouts, giggling, shrilling, tittered, intoning, weeping, clucking, snickering, yelping, babbling, quavered, chattering, sotto voce, cooing, screams, tinkles, whistling, tutting, hissing, groaning, hum, cries, clapping, howling, shrieking, droning, whinnies, grumbling, bellowed, chortling, nodding, chirrup, supplicating, tutted, cawing, keening, twitching, muffled, screeching, trembling, guffawing, croaking, nattering, gabbling, eddying, chirping, exclaiming, warbling, bawling, smirking, sniggering, mouthing, hollering, chitter, caressing, gesticulates, swooning, serenading, throb, gurgle, hooting, squealing, squirming, trilling, pitying, quivering, chiming, growling, squawking, mewl, mewing, bated, kyrie eleison, rustling, snuffling, burbling, bleats, sobbing, harrumphing, prickle, pattering, braying, whirring, cackling, jabbered, chanting, gasping, whimpering, mooing, ululate, crooning, caterwaul, benumbed, deafens, murmurings, rumbling, murmur, humming, moaning, whining, buzz, creaking, roar, tinkling, rumble, rustle, moan, mutter, murmurous, stygian, limpid, lonesome, purling, reedy, ceasing, choked, gelid, gurgling, haunted, icy, mighty, petrifying, pierian, placid, slumberous, soundless, surging, unpolluted

babbling, purl

complaint, sound

grumble, grumbling, murmur, murmuration, mutter, muttering, soft, susurrant, whispering