IPA: /ˌʌnɪkˈspleɪnəbl/
KK: /ʌnɪkˈspleɪnəbl/
Something that cannot be explained or understood; it is mysterious or puzzling.
The sudden disappearance of the plane remains unexplainable to this day.
Unexplainable → It is formed from "un-" (meaning not) and "explain" (from Latin "explanare", meaning to make clear or to unfold) and "-able" (meaning capable of). The word "unexplainable" means not capable of being made clear or understood.
Think of 'not' ('un-') being added to 'make clear' ('explain') and 'capable of' ('-able'). This helps you remember that something unexplainable cannot be made clear.