Source : WordNet®

unvoiced
     adj 1: of speech sounds [syn: {surd}, {voiceless}] [ant: {sonant}]
     2: not using the voice; "unvoiced thoughts"; "unvoiced
        consonants such as `p' and `k' and `s'" [syn: {voiceless}]
        [ant: {voiced}]
     3: 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}, {unspoken}]