A grueling experience is one that leaves a person physically or mentally exhausted. You could also say that the person is very tired from working, but the word "grueling" is much better at describing the level of stress that is felt. The word "grueling" is an adjective that is almost always used to describe a thing (an experience) but not a person.
That looks grueling.
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This page was first published on April 7, 2014.