fiddling vs trivial

fiddling and trivial both are adjectives.

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

As adjectives, fiddling and trivial are synonyms defined as:

Other synonyms of fiddling include footling, lilliputian, little, niggling, petty, picayune, piddling, piffling.

fiddling (adjective)	trivial (adjective)
(informal) small and of little importance	concerned with trivialities
	of little substance or significance
	(informal) small and of little importance