IPA: /ɪnˈɛkspɪkəbl/
KK: /ɪnˈɛkspɪkəbl/
Something that is hard or impossible to explain or understand.
The sudden disappearance of the plane remains inexplicable to investigators.
Inexplicable → It is formed from "in-" (meaning not) and "explicare" (meaning to unfold or explain). The word "inexplicable" means something that cannot be unfolded or explained, hence it is beyond understanding.
Think of something that is 'not' ('in-') able to be 'explained' ('explicare') — that's why we call it inexplicable.