Toploftily is an uncommon word that means to behave or speak in a superior or arrogant manner. Synonyms for toploftily include haughtily, loftily, arrogantly, imperiously, domineeringly, and snobbishly. These words all convey the same sense of behaving as if one is above others, looking down on them, and considering oneself superior. Other related words that could be used as synonyms include patronizingly, condescendingly, audaciously, presumptuously, and proudly. It is important to choose the right word that fits the context and tone of the text, as words have immense power and can influence the reader's perception of the writing and the writer.