unspoken in WordNet English dictionary

1. expressed 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
   mute  tongueless  unspoken  wordless 
   
2. not made explicit
   "the unexpressed terms of the agreement"; "things left unsaid"; "some kind of unspoken agreement"; "his action is clear but his reason remains unstated"
   unexpressed  unsaid  unstated  unuttered  unverbalized  unverbalised  unvoiced  unspoken 
   

unspoken in English Wiktionary