1. 
[syn: unexpressed, unsaid, unstated, unuttered, unverbalized, unverbalised, unvoiced, unspoken]
The Collaborative International Dictionary of English v.0.48:
Unexpressed \Unexpressed\
   See expressed.
WordNet (r) 3.0 (2006):
unexpressed
    adj 1: 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" [syn: unexpressed, unsaid, unstated,
           unuttered, unverbalized, unverbalised, unvoiced,
           unspoken]
Moby Thesaurus II by Grady Ward, 1.0:
22 Moby Thesaurus words for "unexpressed":
   implicit, implied, inferred, silent, tacit, undeclared, understood,
   unmentioned, unproclaimed, unpronounced, unpublished, unrecorded,
   unsaid, unspoken, unsung, untalked-of, untold, unuttered, unvoiced,
   unwritten, voiceless, wordless