undecorated
/ˌʌnˈdekəreɪtɪd/adjective
1
- not adorned or decorated未加装饰的; 简朴的：
the walls were completely undecorated.
墙上没有任何装饰。
2
- (of a member of the armed forces) not honoured with an award（士兵, 军官）未被嘉奖的。