IPA: /ˌʌnɪnˈlaɪtənd/
KK: /ʌnɪnˈlaɪtənd/
Not having knowledge or understanding about something; lacking awareness or insight.
Many people remain unenlightened about the importance of mental health.
Unenlightened → It is formed from "un-" (meaning not) and "enlightened" (from the root "light" meaning to illuminate or provide understanding, with the prefix "en-" meaning to cause to be). The word "unenlightened" means not illuminated or lacking understanding.
Think of 'not' ('un-') having 'light' ('light') or understanding — that's why unenlightened means lacking knowledge or insight.