Artificial intelligent assistant

unagainsayably

unagainˈsayably, adv. Obs. rare.
  [un-1 11.]
  Undeniably.

c 1449 Pecock Repr. i. xx. 130 This firste parte of this present book and The iust apprising of Holi Scripture..schewen vndoutabli and vnaȝenseiabily, that [etc.]. Ibid. iii. xvi. 380. c 1456Bk. of Faith (1909) 222 If this be trewe, as it is unaȝenseiabili trewe.

Oxford English Dictionary

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