trivial vs piffling

trivial and piffling both are adjectives.

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

As adjectives, trivial and piffling are synonyms defined as:

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

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