The spelling gruelling is a variant, but the US spelling of the adjective is grueling (demanding, arduous).
there are two syllables in the word grueling
The girl picked up her pencil to do more grueling homework.I thought the fight was Grueling.The marathon was grueling even though I had trained for weeks.
The long, difficult math exam was found to be grueling by even the most intelligent of the class.
arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome
The following rhyme with gruel: cruel, duel, fuel, refuel. the following rhyme with grueling : refueling dueling
Gruel is a noun.
daunting, excrutiating
a kind of poridge that is feed to the low-class
The three most grueling challenges in this story would probably be: The challenge of being rescued, the irrational fear of the beast, and eventually the challenge of dealing with the evil inside of themselves.
Here are some words that rhyme with fuel:coolcrueldroolduelfoolghoulgrueljeweljoulemulepoolrulespooltoolyou'll
no and they die a horrible grueling death.