"Fatiloquent" is a rare term used to describe someone who is overly confident and boastful in their speech. If you are looking for synonyms to use in place of this word, then you can opt for "bombastic," "grandiloquent," "pompous," "vainglorious," or "overbearing." These words are all synonyms for "fatiloquent" as they convey the same meaning without being too complex. Using simpler words to convey an idea is always encouraged than using overly complicated or obscure vocabulary as it will help you connect with a wider audience. Regardless, all these words can be used interchangeably, making it easier for you to express yourself clearly and concisely.