IPA: //ʌnˈhiːld//
KK: /ʌnˈhiləd/
Not having been healed or recovered from an injury or illness.
The unhealed wound was still painful after several weeks.
Unhealed → It is formed from "un-" (meaning not) and "heal" (from Old English "hælan", meaning to make whole or to cure). The word "unhealed" means not made whole or not cured.
Think of 'not' ('un-') being added to the idea of 'making whole' ('heal') — that's why unhealed means something that is not yet cured.