Artificial intelligent assistant

placentious

placentious, a. Obs. rare.
  [f. L. placēntia suavity, placency + -ous.]
  Pleasing, or disposed to please; complaisant, amiable, agreeable, suave.

a 1661 Fuller Worthies iii. York (1662) 230 A Placentious Person, gaining the goodwill of all. 1683 Pettus Fleta Min. ii. 20 Such things as are placentious or pleasing to us.

Oxford English Dictionary

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