Artificial intelligent assistant

subitous

ˈsubitous, a. Obs.
  [f. L. subitus (see subite) + -ous.]
  Sudden.

1657 W. Morice Coena quasi κοινὴ 341 We find conversion..under the notion of such things as are not onely subitous but instantaneous. 1665 G. Harvey Advice agst. Plague 3 An universal Lassitude, or Subitous soreness of all one's Limbs.

Oxford English Dictionary

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