The belief system, practice, or ideology of being blockheaded; stubborn and willful ignorance, especially as a way of life.
Created by adding '-ism' suffix to 'blockhead,' which creates words for systems of belief or practice (like 'heroism' or 'patriotism'). Rare and mostly humorous usage.
Adding '-ism' (as in religions or political movements) turns a personal flaw into an ideology—'blockheadism' sounds like someone has consciously chosen stupidity as a life philosophy.
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