Possible Clues:

• Tastelessly showy
• Showy, but without taste or worth
• Showy without taste or worth
• Initially trite and wholly uninteresting, becoming cheap and tacky
• Cheers! Prohibitionist drinking whisky -- it's just for show
• In poor taste
• After a time children's author becoming vulgar
• This big marble may not be wet is a poor quality on show
• Cheap marble's dull
• Showy marble protected from the elements?