grimnessgrimness means the characteristic or quality of being grim. Lexicurio rates it Distinctive — a strength score of 68 out of 100.EtymologyFrom Middle English grimnesse, from Old English grimnes (“severity, fierceness, cruelty”), equivalent to grim + -ness.nounThe characteristic or quality of being grim.“This one was almost featureless, as if still in the making, with an aspect of monotonous grimness.”