"silentest" in the adjective sense
1. silent, soundless, still
marked by absence of sound
"a silent house"
"soundless footsteps on the grass"
"the night was still"
2. mum, silent
failing to speak or communicate etc when expected to
"the witness remained silent"
3. silent, tacit, understood
implied by or inferred from actions or statements
"gave silent consent"
"a tacit agreement"
"the understood provisos of a custody agreement"
4. silent, unsounded
not made to sound
"the silent `h' at the beginning of `honor'"
"in French certain letters are often unsounded"
5. silent
having a frequency below or above the range of human audibility
"a silent dog whistle"
6. dumb, mute, silent
unable to speak because of hereditary deafness
Source: WordNet® (An amazing lexical database of English)
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