Artificial intelligent assistant

unfatigable

unˈfatigable, a. Obs.
  [un-1 7 b and 5 b.]
  Indefatigable.

c 1550 Clariodus v. 1925 Apollo restless and unfatigabill. 1592 Nashe P. Penilesse F 2 b, As industrie and vnfatigable toyle rayseth meane persons..to high thrones of authoritie. 1622 Malynes Anc. Law-Merch. 84 Which cannot be done without an vnfatigable industrie. 1627 Lisander & Cal. ix. 184 Hee seemed so unfatigable in his armes.

Oxford English Dictionary

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