Artificial intelligent assistant

dueful

dueful, a. arch.
  (ˈdjuːfʊl)
  [f. due a. + -ful: an anomalous Spenserian formation, prob. on some such analogy as right, rightful.]
  Due, duly belonging, appropriate.

1596 Spenser F.Q. iv. xi. 44 To doe their dueful service, as to them befell. Ibid. vii. vi. 35 Of my desert, or of my dewfull Right. [Also iv. i. 6; vi. x. 32.] 1855 Singleton Virgil I. 84 Ere to the furrows you consign Their dueful seeds. Ibid. 316 For the altars he The dueful sacrifices slew.

Oxford English Dictionary

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