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

Solid

Solid as old times.
—Anonymous

Solid as the eternal rocks.
—Anonymous

Solid like a principle.
—Joseph Conrad

Solid as glass.
—Thomas Hood

Solid as a sod house.
—Alfred Henry Lewis

Solid as the Pyramids.
—Brander Matthews

Solid as a haystack.
—John Ruskin

Solid, like a cactus stem.
—John Ruskin

Solid as bricks.
—George Bernard Shaw

As solid as a landed estate.
—Robert Louis Stevenson

Solid as a wall.
—Martin Farquhar Tupper

Solid as a globe of mud.
—Mark Twain