Artificial intelligent assistant

portentive

porˈtentive, a. Obs. rare.
  [f. L. portent-, ppl. stem of portendĕre to portend + -ive.]
  Having the quality of portending; = portentous 1.

1594 Nashe Terrors Night Wks. (Grosart) III. 245 Commonly that [dream] which is portentiue in a King is but a friuolous fancie in a beggar. 1659 Fuller App. Inj. Innoc. i. 51* The Portentive Idolls of their Country. 1773 J. Ross Fratricide iv. 9 (MS.) The Heavens Portentive roll'd their thunders o'er his head.

Oxford English Dictionary

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