Indigestible

[in-di-jes-tuh-buh l, -dahy-] /ˌɪn dɪˈdʒɛs tə bəl, -daɪ-/

adjective
1.
not digestible; not easily digested.
/ˌɪndɪˈdʒɛstəbəl/
adjective
1.
incapable of being digested or difficult to digest
2.
difficult to understand or absorb mentally: an indigestible book
adj.

late 15c., from in- (1) “not, opposite of” + digestible; or else from Late Latin indigestibilis. Related: Indigestibility.

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