grueling

/ˈɡruːəlɪŋ/
adjective
  1. Extremely tiring, demanding, or difficult; requiring great effort and endurance.
    • Climbing the mountain in the snow was a grueling experience for the hikers.
    • The marathon was a grueling race that tested every runner's stamina.
    • She completed a grueling 12-hour shift at the hospital without a break.
What does "grueling" mean? | whatsthatwordmean | whatsthatwordmean