Artificial intelligent assistant

impressionless

imˈpressionless, a. rare.
  [f. impression + -less.]
  Without impression; void of impressions; unimpressible.

1864 in Webster. 1889 Eng. Illustr. Mag. Apr. 500/1 A face as impressionless and vacant as the white door-post against which he lounged.

Oxford English Dictionary

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