THESAURUS
stifled
arcane, bated, blurred, breathy, cabalistic, censored, choked, choking, classified, close, closed, concealed, croaking, crushed, cryptic, damped, dampened, dark, dead, deadened, drawling, drawly, dull, dulled, dysphonic, enigmatic, esoteric, flat, guttural, harsh, hawking, hermetic, hidden, hoarse, hush-hush, inarticulate, indistinct, latent, lisping, mispronounced, muffled, muted, muzzy, mysterious, nasal, occult, quashed, quavering, quelled, repressed, restricted, secret, shaking, shaky, smashed, smothered, snuffling, softened, sordo, squashed, squelched, strangled, subdued, suffocated, suppressed, thick, throaty, top secret, tremulous, twangy, ulterior, unbreatheable, under security, under wraps, undisclosable, undisclosed, undivulgable, undivulged, unrevealable, unrevealed, unspoken, untellable, untold, unutterable, unuttered, unwhisperable, velar
ROGET THESAURUS
stifled
Faintness
N
faintness, faint sound, whisper, breath, undertone, underbreath, murmur, hum, susurration, tinkle, still small voice, hoarseness, raucity, inaudible, scarcely audible, just audible, low, dull,
stifled, muffled, hoarse, husky, gentle, soft, faint, floating, purling, flowing, whispered, liquid, soothing, dulcet, susurrant, susurrous, in a whisper, with bated breath, sotto voce, between the teeth, aside, piano, pianissimo, d la sourdine, out of earshot inaudibly, (ii) SPECIFIC SOUNDS.