indecent vs unbecoming

indecent and unbecoming both are adjectives.

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

As adjectives, indecent and unbecoming are synonyms defined as:

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

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

indecent (adjective)	unbecoming (adjective)
offensive to good taste especially in sexual matters	not in keeping with accepted standards of what is right or proper in polite society
offending against sexual mores in conduct or appearance
not in keeping with accepted standards of what is right or proper in polite society