Nincompoops is a derogatory word that describes someone who is foolish or incompetent. It is also a slang term that is considered impolite or offensive. If you are looking for a more subtle, professional, or polite way to make a similar reference, here are a few synonyms to consider: simpleton, dimwit, ignoramus, nitwit, dolt, fool, dunce, imbecile, dork, oaf, blockhead, moron, bonehead, numskull, or buffoon. While these words may sound less harsh, please note that they still carry a negative connotation and should be used with caution and respect.