fiddling vs piffling

fiddling and piffling both are adjectives.

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

As adjectives, fiddling and piffling are synonyms defined as:

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

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