Distressing is a related term of gruelling.
As adjectives the difference between distressing and gruelling
is that distressing is causing distress; upsetting while gruelling is so difficult or taxing as to make one exhausted; backbreaking.
As a verb distressing
is .
gruelling
English
Alternative forms
* grueling
Adjective
(
en adjective)
So difficult or taxing as to make one exhausted; backbreaking.
Synonyms
* (so difficult or taxing as to make one exhausted) backbreaking, exhausting