Ostentatious comes from a Latin word meaning "display," and the idea of display is still very apparent in the English word as it is currently used.

Is being ostentatious bad?

The definition of ostentatious is someone or something designed to get notice or draw attention by being inappropriate, showy, vulgar and in bad taste.

What does ostentation mean in English?

1 : excessive display : vain and unnecessary show especially for the purpose of attracting attention, admiration, or envy : pretentiousness She dresses stylishly without ostentation.