IPA: //ʌnˈfaɪndəbl//
KK: /ʌnˈfaɪndəbl/
Something that cannot be found or located.
The lost keys were unfindable, no matter how hard I searched.
Unfindable → It is formed from "un-" (meaning not) and "find" (from Old English "findan", meaning to discover or locate) and "-able" (meaning capable of). The word "unfindable" means not capable of being discovered or located.
Think of 'not' ('un-') being added to 'find' — this helps you remember that 'unfindable' means something that cannot be found.