The quality or state of being eggheaded; absent-mindedness, foolishness, or the characteristic of appearing intelligent but being impractical.
From 'eggheaded' + '-ness' suffix, creating an abstract noun to describe the condition or quality of being eggheaded. This follows standard English word-formation patterns.
The emergence of 'eggheadedness' as a noun reflects how English allows us to turn judgments about people into abstract concepts, letting us discuss intellectual quirks as if they're measurable traits.
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