Tacit

(a.) Understood; implied, but not expressed; silent; as, tacit consent is consent by silence, or by not interposing an objection.

Thesaurus Entries

assumed, implicit, implied, inarticulate, inferred, intimated, silent, suggested, taken for granted, undeclared, understood, unexpressed, unsaid, unspoken, unstated, unuttered, unvoiced, wordless