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

Foolish

Foolish as a calf.
—Anonymous

Foolish as an endeavor to make a lobster climb a tree and give a report of the atmospheric conditions.
—Anonymous

Foolish as a peacock.
—Anonymous

Foolish as to scratch one’s head with a firebrand.
—Anonymous

Foolish as the tailor who sews sleeves to the pocket holes.
—Anonymous

Foolish as to flash a roll of bills before a lawyer.
—Anonymous

Foolish as to talk of color to a blind man.
—Anonymous

Foolish as to try to pull hair from a bald man’s head.
—Anonymous

Thare iz just this difference between a fule and a hen, the fule cackels before, the hen not till after the egg iz lade.
—Josh Billings

More foolish than the prodigal who eats
The husks of sense.
—Lewis Morris

Foolish, as to look for a rainbow in the night.
—Sydney Munden

Foolish as to have confidence to promise himself three years.
—François Rabelais

Foolish as the disturbing phantoms of the night.
—Walter Trumbull

Foolish as a search would be for new sunlight to illuminate the marbles of Michael Angelo.
—William Winter