IPA: //ʌnˈrɪvjuːd//
KK: /ʌnˈrɪvjud/
Something that has not been examined or evaluated by someone.
The article was published in an unreviewed journal, which means it hasn't been checked by experts.
Unreviewed → It is formed from "un-" (meaning not) and "review" (from Old French *reviser*, meaning to look over again). The word "unreviewed" means not looked over again or not examined.
Think of 'not' ('un-') having something 'looked over again' ('review') — that's why unreviewed means it hasn't been examined.