unbecoming
1. [ adjective ] considered inappropriate for or unattractive on a particular person
Examples:

"an unbecoming style"

Related terms: unwearable
2. [ adjective ] not in keeping with accepted standards of what is right or proper in polite society
Synonyms: indecent untoward unseemly uncomely indecorous
Examples:

"was buried with indecent haste" "indecorous behavior" "language unbecoming to a lady" "unseemly to use profanity" "moved to curb their untoward ribaldry"

Related terms: improper
Similar spelling:   unbecomingly