Grueling means something that is extremely demanding, exhausting or tiring. It refers to a task or an activity that requires a great deal of physical or mental effort and can be very challenging to complete.
Usage examples
The marathon runner endured a grueling 26.2-mile race, pushing through exhaustion and muscle cramps.
The students faced a grueling final exam that tested their knowledge of the entire semester's worth of material.
The athletes trained for months to prepare for the grueling triathlon, which included a 2.4-mile swim, a 112-mile bike ride, and a full marathon.
The construction workers labored under the sweltering sun, doing grueling physical work to complete the project on time.
The actress underwent a grueling audition process, performing multiple scenes and monologues for hours in front of the casting directors.
Morning: Have sweet kheer or a bowl of gruel of Whole grain powder 2. (gomama247.com)
Two of the fittest, Terrell Owens and Hershel Walker utilize bodyweight training, no equipment necessary, exercises put together in grueling workouts to push your body to the max, and it can be done just about anywhere. (rocksolidnutritionandwellness.com)
The exercisers in this study had hardly signed up for months of grueling workouts, but even their very modest exertions paid significant dividends, the study found. (inc.com)