Artificial intelligent assistant

ascertainly

† aˈscertainly, adv. Obs. rare—1.
  [f. ascertain a. + -ly2.]
  Certainly, surely, assuredly.

1475 Caxton Jason 12 She was so wreton by loue in his herte so ascertainly that he coude neuer kepe him fro thinking on her.

Oxford English Dictionary

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