The term "know-nothings" refers to people who are ignorant, uninformed, or lacking in knowledge about a certain subject or situation. There are many synonyms for this term, such as ignoramuses, dimwits, simpletons, clueless, unenlightened, and ill-informed. Other words that can be used to describe people who don't know what they're talking about are naive, gullible, foolish, and inexperienced. It is important to remember that using derogatory terms like these can be hurtful, so it is best to use them thoughtfully and sparingly. Instead of insulting someone's intelligence, it is always better to try and educate or inform them in a respectful manner.