Artificial intelligent assistant

mestful

ˈmestful, a. Obs. rare.
  [f. L. mæst-us sad + -ful.]
  = mestive.

1577 T. Kendall Flowers of Epigrammes F v, Emong all other birds, moste mestfull birde am I. 1598 Tofte Alba (1880) 17 Vnto whom shall I (now) dedicate This mestfull verse, this mournfull Elegie?

Oxford English Dictionary

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