knuckleheadery en · NOUN
Etymology
From knucklehead + -ery.
Meanings
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(uncountable) The actions or behavior of a knucklehead.
"[…] his own tone and rhetoric might have been part of the reason for the outbreak of knuckleheadery and half-cockedness in the first place."
2013, Radley Balko, Rise of the Warrior Cop: The Militarization of America's Police Forces: