4
arduously(adverb, badly, severely, vigorously, hardly)
3
exhaustingly(adverb, badly, severely, vigorously, hardly)
3
tryingly(adverb, painfully)
2
agonizingly(adverb, badly, severely, vigorously, hardly)
2
distressingly(adverb, badly, severely, vigorously, hardly)
2
excruciatingly(adverb, painfully)
2
severely(adverb, painfully)
2
torturously(adverb, painfully)
1
achingly(adverb, painfully)
1
acutely(adverb, painfully)
1
aggravatingly(adverb, painfully)
1
annoyingly(adverb, painfully)
1
awkwardly(adverb, badly, severely, vigorously, hardly)
1
badly(adverb, severely, vigorously, hardly, painfully)
1
bitingly(adverb, painfully)
1
bitterly(adverb, painfully)
1
burdensomely(adverb, badly, severely, vigorously, hardly)
1
carefully(adverb, badly, severely, vigorously, hardly)
1
cruelly(adverb, painfully)
1
cumbersomely(adverb, badly, severely, vigorously, hardly)
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APASmart Define. (2013). gruelingly thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/gruelingly/thesaurus/synonyms
ChicagoSmart Define. 2013. "gruelingly thesaurus" https://smartdefine.org/gruelingly/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, gruelingly thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/gruelingly/thesaurus/synonyms>.
MLASmart Define. "gruelingly thesaurus" 17 June 2013. Web. 21 September 2026. <https://smartdefine.org/gruelingly/thesaurus/synonyms>