perfunctory vs formal

perfunctory is not a noun while formal is a noun.

Word	Noun	Adjective	Verb	Adverb
perfunctory	No	Yes	No	No
formal	Yes	Yes	No	No

perfunctory (noun)	formal (noun)
	a gown for evening wear
	a lavish dance requiring formal attire

perfunctory (adjective)	formal (adjective)
hasty and without attention to detail; not thorough	being in accord with established forms and conventions and requirements (as e.g. of formal dress)
done or produced as a formality only	(of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms
	refined or imposing in manner or appearance; befitting a royal court
	logically deductive
	represented in simplified or symbolic form
	characteristic of or befitting a person in authority