IPA: //ʌnˈrɪəlaɪzd//
KK: /ʌnˈriəlaɪzd/
Something that has not yet been achieved or made real.
She has many unrealized dreams that she hopes to fulfill one day.
Unrealized → It is formed from "un-" (meaning not) and "realize" (from Latin "realizare", meaning to make real or actual). The word "unrealized" means not made real or not brought into reality.
Think of 'not' ('un-') making something 'real' ('realize') — that's why unrealized means something that has not been made real.