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From idiot + -ness.
idiotness (uncountable)
- (rare) Synonym of idiocy
2013, Tom Clempson, One Seriously Messed-Up Week-End in the Otherwise Un-Messed-Up Life of Jack Samsonite, London: Atom, →ISBN, page 199:'Sorry!' I laughed stupidly, possibly giving away the truth about my idiotness.