ostentatious
os-ten-ta-tious
adjective
Displaying wealth, knowledge, or possessions in a showy, vulgar, or boastful way.
"Her new diamond necklace was rather ostentatious."
Thesaurus
Synonyms: pretentious, flamboyant, flaunty, showy, splashy, tasteless
Antonyms: unostentatious, unpretending, unpretentious