grim / grim/ • adj. (grim·mer, grim·mest) forbidding or uninviting: his grim expression long rows of grim, dark housing developments. ∎  (of humor) lacking genuine levity; mirthless; black: some moments of grim humor. ∎  depressing or worrying to consider: the grim news of the murder. ∎  allowing no compromise; stern; relentless: grim determination to succeed. ∎  unrelentingly harsh; merciless or severe: few creatures are able to thrive in this grim and hostile land.PHRASES: like grim death with great determination: we had to hold on like grim death.DERIVATIVES: grim·ly adv.grim·ness n.

Grim ★ 1995 (R)

Lives up to its title as an extremely icky and evil subterranean creature is awakened from a long sleep by miners. Apparently not long enough, since he proceeds to rip apart anyone he comes in contact with. 86m/C VHS, DVD . Emmanuel Xuereb, Tres Handley, Peter Tregloan; D: Paul Matthews; W: Paul Matthews; C: Alan M. Trow; M: Dennis Michael Tenney.

grim fierce, cruel OE.; stern or harsh of aspect or demeanour XIV; (of laughter, etc.) unrelenting XVII. OE. = OS. (Du.). OHG. grim (G. grimm), ON. grimmr :- Gmc. *ʒrimmaz, f. *ʒrem- *ʒram- (whence OE. gram angry, gremian make angry) :- IE. *ghrem- *ghrom- (whence Gr. khremizein neigh, OSl. gromí thunder).

grim Grim Reaper a personification of death in the form of a cloaked skeleton wielding a large scythe; reaper in this sense is recorded from the mid 19th century.
like grim death with great determination.