IPA: //ʌnˈbærɪkeɪdɪd//
KK: /ʌnˈbærɪkeɪdɪd/
Not blocked or closed off by barriers.
The doors were unbarricaded, allowing people to enter freely.
Unbarricaded → It is formed from "un-" (meaning not) and "barricade" (from French *barriquer*, meaning to block or obstruct). The word means not blocked or obstructed by a barricade.
Think of 'not' ('un-') being added to 'block' ('barricade') — so unbarricaded means something that is not blocked.