"unvoiced" in the adjective sense
1. unvoiced, voiceless, surd, hard
produced without vibration of the vocal cords
"unvoiced consonants such as `p' and `k' and `s'"
2. unexpressed, unsaid, unstated, unuttered, unverbalized, unverbalised, unvoiced, unspoken
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"
Source: WordNet® (An amazing lexical database of English)
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