mute, tongueless, unspoken, wordless

expressed without speech; especially because words would be inappropriate or inadequate; "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

• inarticulate, unarticulate — without or deprived of the use of speech or words