unseemly vs unbecoming

unseemly and unbecoming both are adjectives.

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

As adjectives, unseemly and unbecoming are synonyms defined as:

unseemly and unbecoming: not in keeping with accepted standards of what is right or proper in polite society

Other synonyms of unseemly include indecent, indecorous, uncomely, untoward.

unseemly (adjective)	unbecoming (adjective)
not in keeping with accepted standards of what is right or proper in polite society	not in keeping with accepted standards of what is right or proper in polite society