Artificial intelligent assistant

dull-witted

dull-witted, a.
  (ˈdʌlˌwɪtɪd)
  [parasynthetic f. dull wit + -ed2.]
  Having a dull wit; stupid.

1387 Trevisa Higden (Rolls) III. 467 Dyvers manere of soules..beeþ witted in a cleer day, and dul witted in an hevy. 1553 Eden Treat. Newe Ind. (Arb.) 22 Dulle witted, of no strength, and Idolaters. a 1680 Butler Rem. (1759) II. 476 Dull-witted Persons are..the fittest Instruments for Wise⁓men to employ. 1887 W. Gladden Parish Probl. 404 The average boy..is [not] duller-witted..now than I was then.

Oxford English Dictionary

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