"Now, now," said one of them, "it becomes not to deal so triflingly with matters of weight."
"By What Authority?"
Robert Hugh Benson
He endeavoured to smile and for a moment to talk triflingly, but could not.
"Anna St. Ives"
Thomas Holcroft
The party were in high spirits-lounging about and jesting-speaking sometimes of trifling matters very seriously, and of serious matters as triflingly-and exercising their wit in particular to great advantage on their absent friends and their affairs.
"The Marvellous History of the Shadowless Man and The Cold Heart"
Adelbert von Chamisso Wilhelm Hauff