Artificial intelligent assistant

grimful

ˈgrimful, a. Obs.
  Also 3 grimfule, 4 grymfull.
  [f. grim n. or a. + -ful.]
  Full of grimness; fierce, terrible.

a 1240 Sawles Warde in Cott. Hom. 253 To i seon eauer þe unseli gastes..biseon on hare grimfule ant grurefule nebbes ant heren hare rarunge. 13.. Minor Poems fr. Vernon MS. (E.E.T.S.) 443 Wyth gret and grymfull wrathe full sone Thei shull heryn a full hard dome. 1715 Disc. on Death 55 Never more shall dread Death's grimful frown.

Oxford English Dictionary

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