慾壑難填 [ㄩˋ ㄏㄜˋ ㄋㄢˊ ㄊㄧㄢˊ; yu4 he4 nan2 tian2] bottomless pit of desire (idiom); insatiable greed carnal cravings are never satisfied and are a main obstruction on the path to enlightenment ◄ ►