1. vaunt Ostentation is an ambitious showing forth of whatever is thought adapted to win admiration or praise; ostentation may be without words; as, the ostentation of wealth in fine residences, rich cl Synonyms: ostentation, boast, flourish, parade, pompousness, vaunt, boasting, pageant, pomp, show, vaunting, display, pageantry, pomposity Antonyms: diffidence, quietness, retirement, timidity, modesty, reserve, shrinking, unobtrusiveness