虚仮 is read as こけ (koke) and means folly.
こけ
koke
こけのあとじあん
hindsight is 20-20 (even for a fool)
こけおどし
empty threat
こけにする
to make a fool of someone
きょぎ
fallacy
きょこう
fiction
きょむ
nihility
きょげん
falsehood
きょしん
open-minded
こくう
empty space
きょじゃく
feebleness
きょえい
vanity
きょえいしん