nondescript
n, adj (personor thing) without a distinctive character and so not easily classified 无明显特徵而不易分类的(人或事物)
He´s such a nondescript you´d never notice him in a crowd. 他没有什麽特徵, 在人群里决显不出他来.
a nondescript landscape, face, voice 无特点的风景、 面孔、 嗓音
nondescript clothes 难以归类的衣服.