(comparative more knuckleheaded, superlative most knuckleheaded)
knucklehead + -ed
"knuckleheaded." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/knuckleheaded>.
knuckleheaded. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/knuckleheaded
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