WordWeb Online

1. Marked by ostentation but often tasteless
   "a cheap showy rhinestone bracelet";
   - flamboyant, splashy
    
2. Displaying brilliance and virtuosity
    
3. (used especially of clothes) marked by conspicuous display
   - flashy, gaudy, jazzy, sporty
    
4. Superficially attractive and stylish; suggesting wealth or expense
   "a showy TV series";
   - glossy

Derived forms: showiest, showier

See also: attractive, colorful [US], colourful [Brit, Cdn], ostentatious, posey [Brit, informal], pretentious, theatric, theatrical