Artificial intelligent assistant

indistinctible

indiˈstinctible, a. Obs. rare.
  [f. in-3 + distinctible, f. L. distinct-, ppl. stem of distinguĕre to distinguish + -ible.]
  Undistinguishable.

1774 Warton Hist. Eng. Poetry (1840) I. Diss. iii. 176 A favourite old romance is founded on the indistinctible likeness of two of Charlemagne's knights, Amys and Amelion.

Oxford English Dictionary

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