Artificial intelligent assistant

irrepugnable

irreˈpugnable, a. Obs.
  [f. ir-2 + repugnable, or a. OF. irrepugnable (15th c. in Godef.).]
  That cannot be fought against or resisted; irresistible.

1578 Banister Hist. Man i. 9 Sited in most eminent perilles, and as it were in the forefront of irrepugnable damages. 1632 Lithgow Trav. ix. 398 note, A comparison of irrepugnable streames. 1683 Tryon Way to Health 475 An irrepugnable Tower against all Evil and Violence.

Oxford English Dictionary

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