Difficult or impossible to digest: an indigestible meal. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "indigestible" in a sentence
"And his opinions were processed the same way, in indigestible chunks."
"This is because they contain indigestible sugars that will be broken down by intestinal bacteria to produce gases such as carbon dioxide, hydrogen sulphide and methane."
"It contains more fat, mineral matter and cellulose (cellulose is often called indigestible fibre, as it resists the solvent action of the digestive juices, and is of no value as a nutrient), and less proteid and digestible carbohydrates."