Ostentatious means to impress or attract attention, overly conspicuous.
Ostentatious comes under adjective.
Synonyms: affected, flamboyant, grandiose, showy, obtrusive, immodest, pretentious, pompous.
Antonyms: reserved, simple, somber, modest, plain, conservative, inconspicuous.
One of my friend ostentatiously donated money to the charity. He hired a band, set off fireworks, and insisted that the newspaper photograph everyone thanking him.
Mr. Ravi's ostentatious display didn't impress me.