undigestible
adjective
un·di·gest·ible
ˌən-dī-ˈje-stə-bəl
-də-
: unable to be digested : not digestible : indigestible
… owl pellets—the balls of undigestible bones and fur coughed up by the birds …—Judith Stone
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Merriam-Webster unabridged
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