(UK, slang, obsolete) To kill or trounce someone.

So difficult or taxing as to make one exhausted; backbreaking.

(racing) A race in which the animal being raced finishes in a state of physical exhaustion. / A gruelling ordeal.

present participle of gruel

In a gruelling manner.

Alternative spelling of gruellingly

Like gruel.

simple past tense and past participle of gruel

plural of gruelling