The scientist examined undigested seed fragments in the owl pellet.

She accidentally swallowed a piece of the toy, which was undigestable and needed to be removed surgically.

He suffered from undigestion after the rich, spicy curry and reached for an antacid.

The scientist studied the undigestibility of the novel synthetic fiber to assess its safety for ingestion.

She found the unfamiliar plant's fruit undigestible and spat it out immediately.

She avoided the undigesting fruit because it made her stomach hurt.