The word "un-ostentatious" means not showy, modest, or not characterized by pretentiousness. Antonyms for this word can include ostentatious, flashy, showy, flamboyant, extravagant, and conspicuous. These words describe things that are overly done, showy, and an attempt to display wealth, status or importance. Ostentatious displays of wealth can be seen on flashy cars, luxury goods or in lavish homes. Being un-ostentatious does not mean that one cannot enjoy the finer things in life, but rather that they do so with modesty and humility. In essence, antonyms for un-ostentatious are words that indicate opulence and shining gem of a lifestyle.