Artificial intelligent assistant

indeprehensible

indepreˈhensible, a. Obs.
  [ad. L. indēprehensibilis not to be seized or caught (Quintil.), f. in- (in-3) + dēprehendĕre to seize, catch, deprehend: see -ible.]
  Incapable of being mentally apprehended or detected; undiscoverable.

1633 T. Morton Discharge 174 (T.) A case perplexed and indeprehensible. 1652 Gaule Magastrom. 142 To presume his errour indeprehensible.

Oxford English Dictionary

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