Definition
Unsent refers to something that has not been dispatched, transmitted, or conveyed. It's the opposite of 'sent'. Imagine a letter still sitting on your desk, or a text message you typed but didn't hit send on. It implies a potential action that was never completed. 'Unsent' represents opportunity, regret, or simply a lack of action. It suggests that a process of delivery has not even started. It can be a powerful word, holding all the possibilities of what could have been communicated.