Meaning of “grim” - Learner’s Dictionary

grim

adjective us uk /ɡrɪm/ grimmer, grimmest
BAD

worrying and bad:

grim news
The future looks grim.
SERIOUS

sad and serious:

a grim expression
UNPLEASANT

A grim place is ugly and unpleasant.

grimly adverb

(Definition of “grim” from the Cambridge Learner’s Dictionary © Cambridge University Press)