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

Blank

Blank as an empty bottle.
—Anonymous

Hopelessly blank, like the face of a blind man.
—Joseph Conrad

Look as blank as a pickpocket.
—Henry James

Blank as the eyeballs of the dead.
—Henry W. Longfellow

Blank as death.
—Alfred Tennyson