Grand-standing, the act of showing off or indulging in self-promotion, has a few different antonyms depending on the context. In political settings, where grand-standing is most commonly associated with, humility and sincerity are two apt antonyms. These words suggest a focus on substance over style, and on genuine intentions rather than political theatrics. In more general contexts, being unassuming or modest can serve as antonyms. These words highlight humility, understatement, and a willingness to not draw too much attention to oneself. Other antonyms could include: selflessness, respectfulness, and restraint. All these words highlight a focus on others, respectfulness rather than self-promotion.