WordWeb Online

1. Characteristic of or befitting a slut or slattern; used especially of women
   "While Scouse was at the bar, the slutty blonde looked at us";
   - blowsy [informal], blowzy [informal], slatternly [archaic], sluttish [informal], tarty [informal]
    
2. Casual and unrestrained in sexual behaviour
   "Slutty women are irresistible to men because they represent the ultimate taboo";
   - easy, loose, promiscuous, sluttish [informal], wanton, tarty [informal]

Derived forms: sluttiest, sluttier

See also: unchaste, untidy

Encyclopedia: Slutty