Behaving flamboyantly refers to acting in a confident and extravagant manner, often marked by a showy display of one's personality or style. Some synonyms that can be used for 'behaving flamboyantly' include 'exuberant', 'flashy', 'glamorous', 'dramatic', 'ostentatious', 'bold', 'eccentric', 'flamboyant', 'outrageous', 'flourishing', 'showy', 'imposing', 'theatrical', and 'assertive'. Each of these synonyms carries a unique nuance, emphasizing different aspects of flamboyant behavior. For instance, 'exuberant' highlights enthusiasm and energy, 'ostentatious' focuses on a display of wealth and status. Regardless of the synonym used, behaving flamboyantly stands out as an attention-grabbing display of confidence and personality.