Definition of unbecoming adjective from the Oxford Advanced Learner's Dictionary

unbecoming

adjective

ˌʌnbɪˈkʌmɪŋ unbecoming pronunciation American

ˌʌnbɪˈkʌmɪŋ

(formal)

1 not suiting a particular person

Synonym

unflatteringShe was wearing an unbecoming shade of purple.2 unbecoming (to/of somebody) not appropriate or acceptable

Synonym

inappropriateHe was accused of conduct unbecoming to an officer.

Opposite

becoming