Artificial intelligent assistant

unperceivably

unperˈceivably, adv.
  [un-1 11, 5 b: cf. prec.]
  Imperceptibly.

a 1395 Hylton Scala Perf. ii. viii. (W. de W. 1494), How it is wonderly & vnperceyuably chaunged..vnto the fayrnes of an angell. 1603 Florio Montaigne iii. iv. 500, I vnperceauablie remooued those dolefull humours from hir. 1695 Bp. Rochester Disc. Clergy 39 With the Scriptures..their Memories will unperceivably be filled. 1713 Guardian No. 56, [They] rolled their trains unperceivably beneath their habits.

Oxford English Dictionary

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