Artificial intelligent assistant

infestious

inˈfestious, a. Obs.
  [irreg. f. L. infest-us (infest a.) or infest v.2, after adjs. in -ious; cf. infectious, etc.]
  Hostile, inimical, troublesome.

1597 Lyly Wom. in Moone iv. i. 191 Detested falsor! that to Stesias' eyes Art more infestious then the basiliske. 1601 R. Johnson Kingd. & Commw. (1603) 234 The king of Adel is his no lesse infestious enimy. 1632 Sir R. Le Grys tr. Velleius Paterc. 201 A Citizen was slaine then whom there had none lived more pernicious to the Commonwealth, nor more infestious to honest men. 1709 Sacheverell Serm. 5 Nov. 23 Like Growing Mischiefs, or Infestious Plagues.

Oxford English Dictionary

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