untainted
adjective uk/ʌnˈteɪn.tɪd/ us/ʌnˈteɪn.t̬ɪd/
未受沾染的，未被污染的;没有污点的，清白无瑕的
not spoiled by anything
He was young and untainted by scandal. 他当时很年轻，没有任何丑闻。
There is no untainted evidence that can be used to convict his client. 没有任何有效证据可以证明他的当事人有罪。