16 entries under closely topic. ×

11
diligently(adverb, thoroughly, seriously, vigorously)
8
industriously(adverb, thoroughly, seriously, vigorously)
7
intently(adverb, thoroughly, sharply, meticulously)
7
painstakingly(adverb, thoroughly, fully, vigorously)
6
strenuously(adverb, thoroughly, seriously, vigorously)
6
persistently(adverb, thoroughly, seriously, vigorously)
5
doggedly(adverb, thoroughly, sharply, meticulously)
5
thoroughly(adverb, fully, completely, carefully)
4
hard(adverb, very, thoroughly, fully, completely)
3
unremittingly(adverb, thoroughly, fully, completely, vigorously)
2
intensively(adverb, very, thoroughly, fully, completely)
2
untiringly(adverb, thoroughly, sharply, meticulously)
1
exhaustively(adverb, very, thoroughly, fully, completely)
1
searchingly(adverb, thoroughly, sharply, meticulously)
1
steadily(adverb, thoroughly, meticulously, determinedly)
1
with determination(expression, adverb, thoroughly, sharply)
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APASmart Define. (2016). assiduously thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/assiduously/thesaurus/synonyms
ChicagoSmart Define. 2016. "assiduously thesaurus" https://smartdefine.org/assiduously/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, assiduously thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/assiduously/thesaurus/synonyms>.
MLASmart Define. "assiduously thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/assiduously/thesaurus/synonyms>