IPA: /ʌnˈwɔːrnəd/
KK: /ʌnˈwɔrnəd/
Not having received a warning or alert about something that may happen.
She was unwarned about the sudden change in plans, which surprised her.
Unwarned → It is formed from "un-" (meaning not) and "warn" (from Old English *warnian*, meaning to give notice or caution). The word "unwarned" means not having been given notice or caution.
Think of 'not' ('un-') having received a 'warning' — that's why unwarned means not warned.