undefiled

The young athlete's spirit was undefiled by the pressure to cheat.

用法提示：undefiled 是形容词，此处作表语，表示‘未被玷污的’，与 by 搭配说明不受某事物影响。

She treasured the undefiled memory of her childhood home.

用法提示：undefiled 是形容词，此处作前置定语修饰 memory，意为‘纯洁的、未被玷污的’。

They vowed to keep the tradition undefiled for their descendants.

用法提示：undefiled 是形容词，在‘keep + 宾语 + 形容词’结构中作宾语补足语，表示‘使……保持纯洁’。