Artificial intelligent assistant

inaudible

inaudible, a.
  (ɪnˈɔːdɪb(ə)l)
  [ad. L. inaudībil-is, f. in- (in-3) + audībilis audible: cf. It. inaudibile (Florio, 1598.).]
  Not audible; not capable of being heard; imperceptible to the ear.

1601 Shakes. All's Well v. iii. 41 Th' inaudible, and noiselesse foot of time. 1626 Bacon Sylva §122 As the Bullet moueth so swift, that it is Inuisible, to the same Swiftnesse of Motion maketh it Inaudible. a 1770 C. Smart Ode St. Cecilia i, Ye, that inform the tuneful spheres, Inaudible to mortal ears. 1875 Jowett Plato (ed. 2) I. 129 An echo in the room which rendered his words inaudible.

Oxford English Dictionary

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