silent

Adjective
  1. Marked by absence of sound (synset 301925827)
    "a silent house"; "soundless footsteps on the grass"; "the night was still"
  2. Failing to speak or communicate etc when expected to (synset 300503732)
    "the witness remained silent"
  3. Implied by or inferred from actions or statements (synset 300945432)
    "gave silent consent"; "a tacit agreement"; "the understood provisos of a custody agreement"
  4. Not made to sound (synset 300176384)
    "the silent `h' at the beginning of `honor'"; "in French certain letters are often unsounded"
  5. Having a frequency below or above the range of human audibility (synset 300176244)
    "a silent dog whistle"
  6. Unable to speak because of hereditary deafness (synset 300153123)

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