piffling vs picayune

piffling and picayune both are adjectives.

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

As adjectives, piffling and picayune are synonyms defined as:

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

piffling (adjective)	picayune (adjective)
(informal) small and of little importance	(informal) small and of little importance