improper vs unbecoming

improper and unbecoming both are adjectives.

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

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