aphonic, brief, brusque, calm, checked, close-lipped, close-tongued, close, closemouthed, concise, curbed, curt, dumb, echoless, economical of words, hush as death, hushed, implicit, implied, inactive, inarticulate, inaudible, incoherent, indisposed to talk, inhibited, laconic, mousy, mum, mute, muted, noiseless, pacific, passive, peaceful, placid, quiescent, quiet, reserved, restrained, reticent, secretive, serene, short, sleeping, snug, soundless, sparing of words, speechless, still, still as death, stilly, subaudible, tacit, taciturn, terse, tight-lipped, tongue-tied, tranquil, unagitated, unarticulated, uncommunicative, undeclared, understood, undisturbed, unexpressed, unhearable, unloquacious, unmentioned, unproclaimed, unpronounced, unpublished, unrecorded, unruffled, unsaid, unsociable, unsounded, unspoken, unstated, unsung, untalkative, untalked-of, untold, untroubled, unuttered, unvocalized, unvoiced, unwritten, voiceless, whist, word-bound, wordless