indigestible

/IH0 N D AY0 JH EH1 S T AH0 B AH0 L/
noun
  1. 1

    Anything that is difficult to digest.

adjective
  1. 1

    Difficult or impossible to digest.

  2. 2

    (by extension) Difficult to accept; unpalatable.

Source: https://en.wiktionary.org/wiki/indigestible