1. [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
2. [adj]  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"

UNSPOKEN is a 8 letter word that starts with U.