Artificial intelligent assistant

plightly

ˈplightly, a. Obs. rare.
  In 3 plihtliche.
  [f. plight n.1 + -ly1.]
  Perilous, of grave import.

c 1205 Lay. 23528 Þa weoren inne Paris Plihtliche spelles ful iwis [c 1275 sori tidynge foliwis].

Oxford English Dictionary

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