WordWeb Online

1. Showing signs of wear and tear
   "an old house with dirty windows and tatty curtains";
   - moth-eaten, ratty, shabby, grotty [Brit, informal]
    
2. Tastelessly showy
   "a tatty car";
   - brassy [informal], cheap, flash [informal], flashy, garish, gaudy, gimcrack, loud, meretricious, tacky [informal], tawdry, trashy

Sounds like: tattie

Derived forms: tattiest, tattier

See also: tasteless, worn