unvoiced

from WordNet (r) 3.0 (2006)

unvoiced
    adj 1: produced without vibration of the vocal cords; "unvoiced
           consonants such as `p' and `k' and `s'" [syn: {unvoiced},
           {voiceless}, {surd}, {hard}] [ant: {soft}, {sonant},
           {voiced}]
    2: not made explicit; "the unexpressed terms of the agreement";
       "things left unsaid"; "some kind of unspoken agreement"; "his
       action is clear but his reason remains unstated" [syn:
       {unexpressed}, {unsaid}, {unstated}, {unuttered},
       {unverbalized}, {unverbalised}, {unvoiced}, {unspoken}]

from The Collaborative International Dictionary of English v.0.48

Unvoiced \Unvoiced\
   See {voiced}.

from Moby Thesaurus II by Grady Ward, 1.0

35 Moby Thesaurus words for "unvoiced":
      echoless, hush as death, hushed, inaudible, mousy, noiseless,
      quiescent, quiet, silent, soundless, still, still as death, stilly,
      subaudible, tacit, unarticulated, undeclared, unexpressed,
      unhearable, unmentioned, unproclaimed, unpronounced, unpublished,
      unrecorded, unsaid, unsounded, unspoken, unsung, untalked-of,
      untold, unuttered, unvocalized, unwritten, whist, wordless