IPA: /ʌnˈsɛnt/
KK: /ʌnˈsɛnt/
Not yet sent, mailed, or posted.
I have an unsent message in my drafts that I need to review before sending.
Unsent → It is formed from "un-" (meaning not) and "sent" (from Old French *sentir*, meaning to feel or to send). The word "unsent" means not sent, indicating something that has not been dispatched or delivered.
Think of 'not' ('un-') having been 'sent' — that's why unsent means something that hasn't been sent.