愚の骨頂 ぐのこっちょう Meanings Expression, Noun the height of folly; sheer stupidity Kanji 愚 foolish. Read as グ. 骨 bone. Read as コツ. 頂 receive. Read as チョウ. Example sentences それは愚の骨頂だ。It's so stupid. Word lists Idioms Jinuma: Japanese Dictionary · Word lists