Indigestible food is difficult or impossible for the stomach to break down.

a tough and indigestible piece of steak 一块咬不动、难消化的牛排

Beans have some indigestible carbohydrates that can give you wind.

Indigestible information is difficult or impossible to understand.

The statistics are virtually indigestible presented in this form. 这个表格里的统计数据简直是叫人看不懂。

The book is a largely indigestible mass of explanations of the legislative process.