frivolous vs trivial

frivolous and trivial both are adjectives.

Word	Noun	Adjective	Verb	Adverb
frivolous	No	Yes	No	No
trivial	No	Yes	No	No

frivolous (adjective)	trivial (adjective)
not serious in content or attitude or behavior	concerned with trivialities
	of little substance or significance
	(informal) small and of little importance