indigestible

Difficult or impossible to digest.

Not digestible physically; unassimilable, as food.

Not digestible mentally; not to be assimilated by the mind; not to be stomached or brooked; incomprehensible or unendurable.

Not digestible; not readily soluble in the digestive juices; not easily convertible into products fitted for absorption.

Not digestible in the mind; distressful; intolerable.