Synonyms for Meretricious (same or very similar meaning)
WordNet sense 1 (tastelessly showy):
brassy, cheap, flash, flashy, garish, gaudy, gimcrack, loud, tacky, tawdry, trashy, tattyWordNet sense 2 (lacking aesthetic or social taste):
tastelessWordNet sense 3 (based on pretense; deceptively pleasing):
specious, gildedWordNet sense 4 (lacking sincerity):
insincereFrom the ODE community, based on WordNetadd/edit