4
troublesome(adjective, hard, tough, severe, difficult)
4
torturing(adjective, painful)
4
abominable(adjective, awful, terrible, horrible, afraid)
4
abysmal(adjective, awful, terrible, horrible, afraid)
4
aching(adjective, painful)
4
acute(adjective, painful)
4
annoying(adjective, painful)
4
grim(adjective, bad, awful, disgusting, hate)
4
irritating(adjective, tough, painful, problematic, trying)
4
labored(adjective, hard, tough, difficult, awkward)
4
piercing(adjective, painful)
3
almighty(adjective, awful, terrible, horrible, afraid)
3
anguishing(adjective, painful)
3
awful(adjective, terrible, horrible, afraid)
3
bad(adjective, awful, terrible, horrible, afraid)
3
beastly(adjective, awful, terrible, horrible, afraid)
3
biting(adjective, painful)
3
bitter(adjective, painful)
3
blatant(adjective, awful, terrible, horrible, afraid)
3
chronic(adjective, awful, terrible, horrible, afraid)
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APASmart Define. (2015). grueling thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/grueling/thesaurus/synonyms
ChicagoSmart Define. 2015. "grueling thesaurus" https://smartdefine.org/grueling/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, grueling thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/grueling/thesaurus/synonyms>.
MLASmart Define. "grueling thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/grueling/thesaurus/synonyms>