pro forma vs perfunctorily

pro forma is an adjective but perfunctorily is not an adjective.

Word	Noun	Adjective	Verb	Adverb
pro forma	No	Yes	No	Yes
perfunctorily	No	No	No	Yes

As adverbs, pro forma and perfunctorily are synonyms defined as:

pro forma and perfunctorily: in a set manner without serious attention; as a formality

pro forma (adjective)	perfunctorily (adjective)
done or produced as a formality only

pro forma (adverb)	perfunctorily (adverb)
in a set manner without serious attention; as a formality	in a set manner without serious attention; as a formality