wordless \word"less\, a.
   not using words; not speaking; silent; speechless. --shak.
   1913 webster

wordless
     adj : 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 syn: mute, tongueless, unspoken
see also:
mute tongueless unspoken 

61 moby thesaurus words for "wordless":
   anaudic, aphasic, aphonic, breathless, brief, brusque, close,
   close-lipped, close-tongued, closemouthed, concise, curt, dumb,
   dumbfounded, dumbstricken, dumbstruck, economical of words,
   implicit, implied, inarticulate, indisposed to talk, inferred,
   laconic, mum, mute, quiet, reserved, reticent, short, silent, snug,
   sparing of words, speechless, stricken dumb, tacit, taciturn,
   terse, tight-lipped, tongue-tied, tongueless, uncommunicative,
   undeclared, understood, unexpressed, unloquacious, unmentioned,
   unproclaimed, unpronounced, unpublished, unrecorded, unsaid,
   unspoken, unsung, untalkative, untalked-of, untold, unuttered,
   unvoiced, unwritten, voiceless, word-bound