unbecoming vs improper

unbecoming and improper both are adjectives.

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

unbecoming (adjective)	improper (adjective)
not in keeping with accepted standards of what is right or proper in polite society	not suitable or right or appropriate
	not appropriate for a purpose or occasion
	not conforming to legality, moral law, or social convention