The word "addleheaded" is an insult that describes someone who is foolish or confused. If you want to describe someone as more addleheaded, there are many synonyms you can use. For example, you might call them clueless, dense, or thick-headed. Other possible synonyms include ditzy, scatterbrained, or airheaded. Alternatively, you might describe them as befuddled, perplexed, or bewildered. Each of these words conveys a sense of confusion or lack of mental clarity, which is the essence of being addleheaded. So the next time you want to insult someone for their lack of sense, consider using one of these synonyms to add some variety to your insults.