There are plenty of synonyms for the phrase "in the grand style." Some examples include "in the most magnificent way," "with great pomp and circumstance," "in a lavish manner," "ostentatiously," and "with great fanfare." These phrases all convey a sense of extravagance and grandeur, indicating that something is being done on a large scale or with great attention to detail. Whether used to describe a royal coronation or a wealthy person's extravagant lifestyle, these synonyms all evoke a sense of opulence and excess, suggesting that something is being done in a way that is impressive, memorable, and perhaps even a bit over the top.