Supposititiously means something that's based on conjecture or assumption. There are many synonyms for this word, including speculative, hypothetical, conjectural, assumed, imagined, and supposed. Other similar words include presumptive, theoretical, putative, postulated, and asserted. Each of these words is used to describe something that's not based on proven facts, but instead is based on the assumption or hypothesis. Whether you're writing academic papers, literature, or journalism, these words can help you sound more sophisticated and articulate. So if you're looking for alternatives to the word "supposititiously," consider these synonyms to elevate your writing!