ぐこっちょう 愚の骨頂 LinksSentence search for 愚の骨頂Sentence search for ぐのこっちょうKanji details for 愚, 骨 and 頂Edit in JMdict Expressions (phrases, clauses, etc.), Noun1. the height of folly; sheer stupidityIdiomatic expression Discussions Log in to talk about this word.