1. Marked by absence of sound
   "a silent house";
   - soundless, still
    
2. Failing to speak or communicate etc. when expected to
   "the witness remained silent";
   - mum
    
3. Not made to sound
   "the silent ‘h’ at the beginning of ‘honour’";
   - unsounded
    
4. Having a frequency below or above the range of human audibility
   "a silent dog whistle"
    
5. Implied by or inferred from actions or statements
   "gave silent consent";
   - tacit, understood
    
6. Unable to speak because of hereditary deafness
   "The silent child learned to communicate through sign language";
   - dumb, mute
    
7. Expressed without speech
   "a silent curse";
   - mute, tongueless, unspoken, wordless

See also: implicit, inarticulate, inaudible, incommunicative, inexplicit, quiet, unarticulate, uncommunicative, unhearable

Encyclopedia: Silent, Charles