Synonyms for Grueling:

• adj.

  •difficult, taxing (adjective)
  • grinding,
  • crushing,
  • exhausting,
  • chastening,
  • tiring,
  • punishing,
  • backbreaking,
  • Fatiguing,
  • heavy,
  • harsh,
  • demanding,
  • laborious,
  • excruciating,
  • trying,
  • strenuous,
  • hard,
  • torturous,
  • arduous,
  • severe.
  •painful (adjective)
  • inflaming,
  • unpleasant,
  • painful,
  • offensive,
  • harrowing,
  • cutting,
  • smarting,
  • piercing,
  • cruel,
  • throbbing,
  • crushing,
  • stinging,
  • grievous,
  • burdensome,
  • Irksome,
  • sore,
  • aggravating,
  • severe,
  • agonizing,
  • troublesome,
  • woeful,
  • withering,
  • arduous,
  • anguishing,
  • aching,
  • oppressive,
  • bothersome,
  • Besetting,
  • insufferable,
  • disagreeable,
  • biting,
  • trying,
  • uncomfortable,
  • acute,
  • miserable,
  • bitter,
  • wrenching,
  • annoying,
  • horrendous,
  • Gnawing,
  • odious,
  • excruciating,
  • stabbing,
  • chafing,
  • distressful,
  • irritating,
  • unbearable,
  • torturing,
  • tormenting,
  • Cramping,
  • hurtful.

• n.

  •exhausting (noun)
  • Fatiguing,
  • tiring.
  •grueling (noun)
  • backbreaking,
  • heavy,
  • arduous,
  • gruelling,
  • toilsome,
  • laborious,
  • punishing,
  • labourious,
  • hard,
  • effortful.

• Other synonyms:

  •oppressive
  • onerous.
  •Other relevant words:
  • grinding,
  • rap,
  • straining,
  • hefty,
  • exacting,
  • corrective,
  • harsh,
  • laborious,
  • cloggy,
  • strong,
  • killing,
  • onerous,
  • uphill,
  • Weariful,
  • oatmeal,
  • fermented,
  • leaden,
  • congee,
  • chastening,
  • effortful,
  • strenuous,
  • enfeebling,
  • voiceless,
  • thick,
  • pap,
  • punitory,
  • stressful,
  • clayey,
  • heavy,
  • tough,
  • gravid,
  • overweight,
  • difficult,
  • strained,
  • Fatiguing,
  • Moiling,
  • taxing,
  • labourious,
  • lumbering,
  • Chastising,
  • expectant,
  • punitive,
  • backbreaking,
  • problematical,
  • toilsome,
  • ponderous,
  • wearisome,
  • weighty,
  • lowering,
  • Operose,
  • wasting,
  • vexatious,
  • porridge,
  • impenetrable,
  • sweaty,
  • gruel,
  • mush,
  • threatening,
  • tiring,
  • Mushing,
  • sonorous,
  • punishing,
  • not easy,
  • demanding,
  • tiresome,
  • pick-and-shovel,
  • plaguey,
  • wearing,
  • enervating,
  • laboured,
  • sound,
  • Pasting,
  • hard-fought,
  • weighed down,
  • weakening,
  • wearying,
  • torturous,
  • hard-earned,
  • enceinte,
  • dense,
  • penal,
  • Castigatory,
  • Penological,
  • mess,
  • paste,
  • draining,
  • rough,
  • labored,
  • whack,
  • profound,
  • sullen,
  • retributive,
  • grave,
  • gruelling,
  • Messing,
  • hard,
  • fleshy,
  • Sapping,
  • forced,
  • persnickety,
  • exhausting,
  • waste,
  • hellacious,
  • Mashing,
  • pulp,
  • accented,
  • Inflictive,
  • disciplinary,
  • shattering.

Antonyms for Grueling:

• adj.

  • difficult, taxing
    kind, easy, trivial, gentle, facile, effortless.
  • Other antonyms:
    light, accessible, doable, uncomplicated, soothing, relaxed, clear, painless, elementary, user-friendly, undemanding, achievable, comforting, mindless, gentle, unchallenging, friendly, manageable.