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Adjective: indigestible  ,in-di'jes-tu-bul
  1. Not easily digested or unable to be digested by the body
    "The heavy meal proved indigestible and caused discomfort"

See also: flatulent, heavy, inedible, nondigestible, stodgy, undigested, uneatable, windy [Brit, informal]

Antonym: digestible