improperly vs improper

improperly is not an adjective while improper is an adjective.

Word	Noun	Adjective	Verb	Adverb
improperly	No	No	No	Yes
improper	No	Yes	No	No

improperly (adjective)	improper (adjective)
	not suitable or right or appropriate
	not appropriate for a purpose or occasion
	not conforming to legality, moral law, or social convention

improperly (adverb)	improper (adverb)
in an improper way