The quality of being somewhat blockheaded or showing occasional stubbornness and lack of understanding.
Noun form of 'blockheadish' created by adding '-ness,' which makes it refer to the abstract quality rather than describing an action or manner.
English word-building lets us stack suffixes like linguistic Lego—'blockhead' + 'ish' + 'ness' creates a word that means 'the quality of being somewhat stubbornly stupid,' all from one root word.
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