16 entries under closely topic. ×

9
industriously(adjective, adverb, hard, thoroughly, vigorously)
8
hard(adverb, strong, thoroughly, extremely)
6
assiduously(adverb, thoroughly, seriously, vigorously)
6
diligently(adverb, thoroughly, seriously, vigorously)
4
intently(adverb, thoroughly, earnestly, heartily)
3
intensively(adverb, thoroughly, meticulously, determinedly)
3
persistently(adverb, thoroughly, seriously, vigorously)
2
doggedly(adverb, thoroughly, actively, firmly)
2
painstakingly(adverb, thoroughly, seriously, vigorously)
2
unremittingly(adverb, thoroughly, seriously, vigorously)
1
exhaustively(adverb, thoroughly, meticulously, determinedly)
1
searchingly(adverb, thoroughly, meticulously, determinedly)
1
steadily(adverb, thoroughly, vigorously, strongly)
1
untiringly(adverb, thoroughly, meticulously, determinedly)
1
with determination(expression, adverb, thoroughly, firmly)
0
thoroughly(adverb, meticulously, determinedly, obstinately)
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APASmart Define. (2015). strenuously thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/strenuously/thesaurus/synonyms
ChicagoSmart Define. 2015. "strenuously thesaurus" https://smartdefine.org/strenuously/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, strenuously thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/strenuously/thesaurus/synonyms>.
MLASmart Define. "strenuously thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/strenuously/thesaurus/synonyms>