driven

*pure as the driven snow

pure and chaste. (Often used ironically. *Also: as ~.) Jill: Sue must have gone to bed with every man in town. Jane: And I always thought she was as pure as the driven snow. Robert was notoriously promiscuous, but tried to convince all his girlfriends that he was pure as the driven snow.

See also: pure, snow

*white as a sheet and *white as a ghost; *white as snow; *white as the driven snow

[of someone] extremely pale, as if frightened. (*Also: as ~.) Marilyn turned as white as a sheet when the policeman told her that her son had been in a car wreck. Did something scare you? You're white as a sheet! Jane made up the bed with her best linen sheets, which are always as white as snow. We have a new kitten whose fur is white as the driven snow.

See also: sheet, white

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be as pure as the driven snow

to be morally good How dare he criticize me for having an affair? He's not exactly as pure as the driven snow himself.

See also: pure, snow