piffling vs fiddling

piffling and fiddling both are adjectives.

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

As adjectives, piffling and fiddling are synonyms defined as:

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

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