trivial vs picayune

trivial and picayune both are adjectives.

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

As adjectives, trivial and picayune are synonyms defined as:

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

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