
Indigestible
Physical Discomfort
Use 'indigestible' when explaining why certain foods cause stomachaches or digestion problems. 
Negative Connotation
'Indigestible' often implies that the food is not just heavy, but unpleasant and should be avoided. 
Metaphorical Usage
Sometimes 'indigestible' describes situations or experiences that are hard to accept or process, not just food. 