The adverb sic, usually enclosed in brackets, is a word editors use in the reproduction of someone else's speech or writing to indicate that an unexpected form exactly reproduces the original and is not a copier's mistake. Sic comes from Latin, in which it means "so" or "thus." Though it's a useful tool, some usage commentators feel it is bad manners to use a sic to needlessly call attention to someone's error or to deride the language of a less-educated person.