Open English Wordnet
Adjectives
(s)silent, soundless, stillmarked by absence of sound“a silent house”,
“soundless footsteps on the grass”,
“the night was still” (s)mum, silentfailing to speak or communicate etc. when expected to“the witness remained silent” (s)silent, tacit, understoodimplied by or inferred from actions or statements“gave silent consent”,
“a tacit agreement”,
“the understood provisos of a custody agreement” (s)silent, unsoundednot made to sound“the silent ‘h’ at the beginning of ‘honor’”,
“in French certain letters are often unsounded” (s)silenthaving a frequency below or above the range of human audibility“a silent dog whistle” (s)mute, tongueless, unspoken, wordless, silentexpressed without speech“a mute appeal”,
“a silent curse”,
“best grief is tongueless” (Emily Dickinson),
“the words stopped at her lips unsounded”,
“unspoken grief”,
“choking exasperation and wordless shame” (Thomas Wolfe)