IPA: /ʌnˈklæsɪfaɪd/
KK: /ʌnˈklæsɪfaɪd/
Something that is not assigned to a specific group or category.
The report was marked as unclassified, so it could be shared with the public.
Unclassified → It is formed from "un-" (meaning not) and "classified" (from Latin "classificare", meaning to arrange into classes). The word "unclassified" means not arranged into any specific class or category.
Think of 'not' ('un-') being added to 'arranged into classes' ('classified') — that's why unclassified means something that hasn't been sorted into any category.