1 Not having any serious purpose or value.
1.1 (of a person) carefree and superficial.
Late Middle English from Latin frivolus ‘silly, trifling’ + -ous.
Do not let anyone tell you that wordplay is frivolous, and it’s a darn sight better than playing with your food!
Did anybody else notice, some word genius decided that giving -ous to the end of the word was better than the shorter/simpler Latin spelling?