WordWeb Online

1. Tastelessly showy
   "a meretricious yet stylish book"
   - brassy, cheap, flash, flashy, garish, gaudy, gimcrack, loud, tacky, tatty, tawdry, trashy, schlocky []
    
2. Based on pretence; deceptively pleasing
   "meretricious praise"; "a meretricious argument"
   - gilded, specious
    
3. [archaic] Like or relating to a prostitute
   "meretricious relationships"

See also: insincere, meretriciousness, prostitute, tasteless