Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Grim

Grim as a judge.
—Anonymous

Grim as Cerberus.
—Anonymous

Grim as death.
—Anonymous

Grim as a voice from the grave.
—A. H. Beesly

Grim as a Swiss guard.
—Robert Browning

Grim as a grizzly fighting for her cub.
—John G. Neihardt

Grim as a crow.
—Joseph Skipsey

Grim as dreams that quicken from dead men’s graves.
—Algernon Charles Swinburne

Grim as hell.
—Algernon Charles Swinburne