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

Trivial

Trivial as a parrot’s prate.
—William Cowper

Trivial as to attempt to blow out the stars.
—George W. Curtis

As trivial as if a painter should put real gold upon his canvas instead of representing gold by means of paint.
—George W. Curtis

Trivial as the giggle of a housemaid.
—Henry James

Trivial as the tears of infancy.
—John Randolph