Indigestible (adjective)

1. Not easily digested or not able to be broken down by the body's digestive system.
2. Not easily understandable or not able to be comprehended.

Origin:

This word is derived from the latin word "indigestus" which is formed by the combination of the prefix "in-" meaning "not" and the word "digestus" meaning "digestible" or "easily digested".

Examples:

1. Some types of fiber are indigestible and pass through the body undigested.
2. The food was indigestible and caused stomach upset.
3. The novel was indigestible, full of obscure references and complex themes.
4. The lecture was indigestible, with too much technical jargon.
5. The task was indigestible and required a lot of effort to complete.