IPA: /ˈɡruːəlɪŋ/
KK: /ˈɡruːlɪŋ/
Very difficult and tiring, often causing exhaustion.
The marathon was a grueling test of endurance for all the runners.
Grueling originates from the verb 'gruel', which comes from the Old French 'gruau' (meaning oatmeal or porridge). The suffix '-ing' indicates the action or process. Thus, 'grueling' refers to something that is as exhausting as the effort required to prepare or consume a difficult meal.
Think of the exhausting effort involved in preparing or eating a tough meal like gruel — that's why grueling means extremely tiring.