In the English language, the word "nigger" is an ethnic slur, usually directed at black people. The word originated as a neutral term referring to people with black skin, as a variation of the Spanish and Portuguese noun negro, a descendant of the Latin adjective niger ("black"). It was often used derogatorily, and by the mid-twentieth century, particularly in the United States, its usage became unambiguously pejorative, a racist insult. Accordingly, it began to disappear from popular culture, and its continued inclusion in classic works of literature has sparked controversy.