nondescript

详细解释:a. 莫可名状的, 难以区别的
n. 难以名状的事物, 不属任何类型的人

英语解释：

名词 nondescript:

a person is not easily classified and not very interesting

形容词 nondescript:

lacking distinct or individual characteristics; dull and uninteresting同义词：characterless