Block-headed is often used to describe someone who is slow-witted or stubborn. However, there are many synonyms to describe such a person. For instance, obtuse, dense, and thick, are all words that can be used interchangeably with block-headed. Similarly, pigheaded, inflexible, and obstinate are also useful synonyms to indicate someone who is resistant to change or new ideas. Other synonyms for this word include unintelligent, dull, and dim-witted. As one might imagine, the use of these words can be considered derogatory, which is why it is important to use them with care and sensitivity.