Artificial intelligent assistant

undefatigable

undeˈfatigable, a. Obs.
  (un-1 7 b and 5 b.)

1630 tr. Camden's Hist. Eliz. iv. 89 Meane while, the Lord Deputy with vndefatigable paynes prosecuteth Mac-Hugh. 1662 W. Gurnall Chr. in Arm. iii. xx. §1 Men, furnished by the blessing of God on their undefatigable labours and studies.

Oxford English Dictionary

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