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Silent

Quiet, hushed, noiseless, still, calm, tranquil, peaceful, serene, soundless, mute, muffled, soft, low, gentle, subdued, inaudible, hush, calm, motionless, placid, unspoken, wordless, unvoiced, tacit, reticent, reserved, introverted, shy, withdrawn, bashful, timid, diffident, reticent, uncommunicative, tight-lipped, closed-mouthed, secretive, private, discreet, unobtrusive, unnoticeable, unnoticed, unperceived, imperceptible, undetectable, invisible, hidden, covert, undercover.