Artificial intelligent assistant

supererogative

supererogative, a. rare.
  (ˌs(j)uːpərɪˈrɒgətɪv)
  [f. late L. superērogāt- (see supererogate) + -ive.]
  = supererogatory.

1599 Sandys Europæ Spec. xlii. (1605) P j, Their spirituall treasure of super[er]ogative [ed. 1629 Supererogatorie] workes. 1611 A. Stafford Niobe ii. 61 A fellow..who can iustlie brag of nothing of his owne, but liues vpon the supererogatiue deedes of his Ancestours. 1641 Milton Animadv. ii. 15 O new and never-heard of Supererogative heighth of wisdome and charity in our Liturgie!

Oxford English Dictionary

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