silent

adjective

1. marked by absence of sound"a silent house"
2. failing to speak or communicate etc. when expected to"the witness remained silent"
3. implied by or inferred from actions or statements"gave silent consent"
4. not made to sound"the silent ‘h’ at the beginning of ‘honor’"
5. having a frequency below or above the range of human audibility"a silent dog whistle"
6. unable to speak because of hereditary deafness
7. expressed without speech"a mute appeal"