Etymology
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ostentatious (adj.)

1701, "characterized by display or show from vanity or pride;" 1713, "showy, gaudy, intended for vain display," from ostentation + -ous. Earlier in a similar sense were ostentative (c. 1600); ostentive (1590s); ostentous (1620s). Related: Ostentatiously; ostentatiousness (1650s).

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Definitions of ostentatious

ostentatious (adj.)
intended to attract notice and impress others;
an ostentatious sable coat
Synonyms: pretentious
ostentatious (adj.)
(of a display) tawdry or vulgar;
Synonyms: pretentious
From wordnet.princeton.edu