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Adjective: ostentatious  ,ós-tun'tey-shus or ,ós,ten'tey-shus
  1. Intended to attract notice and impress others
    "an ostentatious sable coat";
    - pretentious, posey [Brit]
  2. (of a display) tawdry or vulgar
    - pretentious, kitsch, kitschy

See also: flamboyant, flaunty, showy, splashy, tasteless

Antonym: unostentatious