The quality or state of being foolish, stupid, or prone to making blunders.
Built from 'blunderheaded' plus the abstract noun suffix '-ness,' which forms nouns expressing qualities or states. This suffix comes from Old English '-nes,' used to create abstract nouns from adjectives.
By the time we get to 'blunderheadedness,' we've stacked four morphemes on top of each other: blunder + head + ed + ness—English lets us build towering word-buildings for abstract ideas!
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