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Synonyms for Unspoken (same or very similar meaning)

WordNet sense 1 (not made explicit):
unexpressed, unsaid, unstated, unvoiced, unuttered, unverbalised, unverbalized

WordNet sense 2 (implied though not directly expressed; inherent in the nature of something):
implicit, inexplicit

WordNet sense 3 (expressed without speech; especially because words would be inappropriate or inadequate):
mute, tongueless, wordless

WordNet sense 4 (without or deprived of the use of speech or words):
inarticulate, unarticulate

From the ODE community, based on WordNetadd/edit