Artificial intelligent assistant

doubter

ˈdoubter
  [f. as prec. + -er1.]
  One who doubts; one who is uncertain or in doubt.

1603 Florio Montaigne ii. xii. (1632) 294 Some have judged Plato a Dogmatist, others a Skeptike or a Doubter. 1682 Bunyan Holy War xi, Diabolus..his army consisted all of Doubters. Ibid., The third captain was Captain Damnation: he was captain over the grace doubters. 1751–73 Jortin Eccl. Hist. (R.), Obliged to answer doubters and cavillers. 1852 Jerdan Autobiog. II. xix. 264 A much more respectable doubter of my statements.

Oxford English Dictionary

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