IPA: /ˌʌnɪkˈsplɔrd/
KK: /ʌnɪkˈsplɔrd/
Something that has not been examined or investigated yet.
The unexplored cave held many secrets waiting to be discovered.
Comparative: more unexplored
Superlative: most unexplored
Unexplored → It is formed from "un-" (meaning not) and "explored" (from Latin "explorare", meaning to investigate or search out). The word "unexplored" means not investigated or not searched out.
Think of 'not' ('un-') having been 'searched out' ('explored') — that's why unexplored means something that hasn't been investigated.