Blockheaded is a word that is used to describe someone who is stupid or thick-headed. There are many synonyms for this word, depending on the situation and context. Some of the most commonly used synonyms include obtuse, dense, dim-witted, dull, and unintelligent. Other synonyms for blockheaded include ignorant, foolish, and slow-witted. In certain contexts, the word blockheaded might also be replaced by words like oblivious or clueless. Regardless of which synonym is used, all of them conveys a sense of someone who is not very bright or intelligent. When choosing a synonym for blockheaded, it is important to consider the tone and context of the sentence and choose a word that is appropriate.