unbecoming
/ˌʌnbɪˈkʌmɪŋ/adjective
1- (especially of clothing or a colour) not flattering（尤指衣服, 颜色）不合式的; 难看的：
a stout lady in an unbecoming striped sundress.
穿难看条纹太阳裙的胖女人。
1.1
- (of a person's attitude or behaviour) not fitting or appropriate; unseemly（态度, 行为）不合适的; 不得体的; 不合礼节的：
it was unbecoming for a university to do anything so crass as advertising its wares.
大学蠢到用广告推销自己课程之类的服务真不得体。
派生词