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

Solemn

Solemn as a judge.
—Anonymous

Solemn as a slate gravestone.
—Anonymous

Solemn as a thunderbolt.
—Anonymous

As solemn as any catafalque.
—Anonymous

Solemn as organ music.
—Anonymous

Solemn as a king on a five-franc piece.
—Honoré de Balzac

Solemn, as a thought of God.
—Elizabeth Barrett Browning

Solemn as despair.
—Edward Bulwer-Lytton

Solemn, like the cloudy groan of dying thunder on the distant wind.
—Lord Byron

Solemn as the long stops upon an organ.
—John Dryden

Solemn as an owl.
—Johann Wolfgang von Goethe

Solemn as a dying nun.
—Maurice Hewlett

Solemn as putty.
—Rudyard Kipling

Solemn as a parson’s clerk.
—George Meredith

Solemn as a monkey after committing a mischief.
—François Rabelais