虚仮の後思案 こけのあとじあん Also written こけの後思案 Meanings Expression hindsight is 20-20 (even for a fool) See also: 下衆の後知恵 (げすのあとぢえ). Kanji 虚 void. Read as コ. 仮 temporary 後 after. Read as あと. 思 think 案 plan. Read as アン. Jinuma: Japanese Dictionary · Word lists