The quality or state of being blockheaded; stupidity combined with stubborn refusal to understand or change.
Noun form created by adding '-ness' suffix to 'blockheaded,' creating an abstract noun denoting the characteristic or quality of having this trait.
English lets us create incredibly specific words for personality flaws—'blockheadedness' isn't just stupidity, it's specifically the stupid stubbornness of someone who won't listen to reason.
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