57 entries under vigorously topic. ×

10
laboriously(adverb, easy, badly, severely)
9
strenuously(adverb, badly, severely, earnestly)
8
painfully(adverb, badly, severely, painfully)
7
hardly(adverb, badly, severely, extremely)
5
industriously(adverb, earnestly, actively, hastily)
4
toilsomely(adverb, badly, severely, hardly)
3
assiduously(adverb, seriously, intensely, earnestly)
3
awkwardly(adverb, badly, severely, hardly)
3
gruelingly(adverb, badly, severely, hardly)
3
harshly(adverb, badly, severely, hardly)
3
painstakingly(adverb, earnestly, actively, hastily)
3
with difficulty(expression, idiom, adverb, badly, severely)
2
agonizingly(adverb, badly, severely, hardly)
2
carefully(adverb, badly, severely, earnestly)
2
diligently(adverb, earnestly, actively, hastily)
2
distressingly(adverb, badly, severely, hardly)
2
inconveniently(adverb, badly, severely, hardly)
2
indefatigably(adverb, earnestly, actively, hastily)
1
actively intently(expression, earnestly, hastily, carefully)
1
agilely(earnestly, actively, hastily, carefully)
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APASmart Define. (2015). arduously thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/arduously/thesaurus/synonyms
ChicagoSmart Define. 2015. "arduously thesaurus" https://smartdefine.org/arduously/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, arduously thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/arduously/thesaurus/synonyms>.
MLASmart Define. "arduously thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/arduously/thesaurus/synonyms>