unspoken

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

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”