(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)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)