When looking for alternative words to express the superlative degree of stupidity, one can use a range of synonyms to convey similar meaning. Instead of "stupidest", one might consider phrases like "most unintelligent", indicating a lack of cognitive ability. Alternatively, the term "most foolish" can highlight poor judgment or decision-making. Similarly, "most ignorant" showcases a lack of knowledge or awareness. Furthermore, "most senseless" underscores actions or ideas lacking any rationality. Lastly, "most ridiculous" refers to absurd or laughable behavior. Remember, although these synonyms express similar concepts to "stupidest", the choice of word should always be in line with the desired tone and context.