fiddling vs piddling

fiddling and piddling both are adjectives.

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

As adjectives, fiddling and piddling are synonyms defined as:

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

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