The word "龌龊" is formed from two characters, both containing the "齿" (tooth) radical as a semantic component. The character "龌" combines "齿" with "屋" (house), where "屋" primarily serves as a phonetic indicator. The character "龊" combines "齿" with "足" (foot), where "足" primarily serves as a phonetic indicator. Together, these characters create a disyllabic word that means "dirty" or "filthy", though the original radical relates to teeth, reflecting historical character construction.