slattern UK /ˈslætən/US /ˈslætɚn/noun 2forms 1phrases 1 noun2 •(old-fashioned) One who is uncareful or unconcerned about appearance or surroundings, usually said of a dirty and untidy woman. •(offensive) A slut, a sexually promiscuous woman. formsslatterns Phrases with slattern slattern awayTo consume carelessly or wastefully; to waste.