IPA: /ˌʌndɪsˈkʌvərəbl/
KK: /ʌndɪsˈkʌvərəbəl/
Something that cannot be found or revealed; it is completely hidden or inaccessible.
The ancient ruins were considered undiscoverable due to the dense jungle surrounding them.
Undiscoverable → It is formed from "un-" (meaning not), "discover" (from Latin "discooperire", meaning to uncover or reveal), and "-able" (meaning capable of). The word "undiscoverable" means not capable of being uncovered or revealed.
Think of 'not' ('un-') being added to 'discover' which means to uncover something, and the '-able' indicates it can't be done. This helps you remember that 'undiscoverable' refers to something that cannot be uncovered.