inexplicable (adj.)youdaoicibaDictYouDict[inexplicable 词源字典]
early 15c., from Middle French inexplicable or directly from Latin inexplicabilis "that cannot be unfolded or disentangled, very intricate," figuratively, "inexplicable," from in- "not, opposite of" (see in- (1)) + explicabilis "that may be explained" (see explicable). Related: Inexplicably.[inexplicable etymology, inexplicable origin, 英语词源]