inscrutable

Difficult to understand or interpret; impenetrable.

Incapable of being searched into or scrutinized; impenetrable to inquiry or investigation; incognizable.

Synonyms Impenetrable, undiscoverable, incomprehensible, unsearchable, mysterious.

Unsearchable; incapable of being searched into and understood by inquiry or study; impossible or difficult to be explained or accounted for satisfactorily; obscure; incomprehensible.

Difficult or impossible to comprehend, fathom, or interpret.