1. not able to be digested or broken down by the digestive system
2. difficult to understand, accept, or process mentally
Usage: figurative

Examples

• The tough cellulose in raw vegetables can be undigestible for some people.
• Certain artificial sweeteners are undigestible and pass through the body unchanged.
• The complex scientific report was undigestible for most readers.
• She found his harsh criticism undigestible and walked away.
• High-fiber foods contain undigestible components that aid in digestion.
• The professor’s dense lecture was completely undigestible to the students.