❶not soiled by a speck of dust; spotless ❷uncontaminated maintain one’s original pure character 她家里件件家俱～。In her home every piece of furniture is spotless. ❍ 在那动乱的岁月中，他保持～，实在难能可贵。It was estimable for him to maintain his original pure character during those chaotic times.
纤尘不染xiān chén bù rǎn
纤尘：指细微的灰尘。一点灰尘都没有沾染上。be as clean as a new pin, spotless, uncont-aminated maintain one’s original pure character, be spotless clean