Artificial intelligent assistant

darkful

darkful, a. rare.
  (ˈdɑːkfʊl)
  [OE. deorcfull, f. deorc adj. dark: see -ful.]
  Full of darkness.

a 1050 Liber Scintill. lxi. (1889) 187 Eall lichama þin deorcfull byð. 1382 Wyclif Matt. vi. 23 Ȝif thyn eiȝe be weyward, al thi body shal be derkful. c 1470 Henry Wallace viii. 1182 The nycht was myrk, our drayff the dyrkfull chance. 1633 T. Adams Exp. 2 Peter i. 19 Pagans have a darkful night. 1875 M{supc}Clellan New Test. 390 The horrible degradation of mankind to a darkful existence.

Oxford English Dictionary

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