罄竹难书

qìng zhú nán shū

so many that the bamboo slats have been exhausted

innumerable crimes (idiom); see also 罄筆難書|罄笔难书[qing4 bi3 nan2 shu1]

罄

qìng

to use up

竹

zhú

(bound form) bamboo

难

nán

difficult (to...)

书

shū

abbr. for 書經|书经[Shu1 jing1]