What is another word for most thick-skulled?
Pronunciation: [mˈə͡ʊst θˈɪkskˈʌld] (IPA) 
When it comes to describing someone who is stubborn and refuses to listen, the phrase "most thick-skulled" might come to mind. However, there are many alternative ways to express this same idea. Some synonyms to consider are: obstinate, pigheaded, bullheaded, inflexible, unyielding, immovable, hardheaded, bullheaded, and stiff-necked. These words imply a sense of resistance to change or new ideas, and suggest that the person in question is difficult to persuade. Choosing the right synonym can add nuance and precision to your writing or conversation, allowing you to communicate your meaning with greater clarity.
