40 entries under vigorously topic. ×

12
carefully(adverb, thoroughly, seriously, intensely)
11
indefatigably(adverb, earnestly, actively, hastily)
9
industriously(adverb, thoroughly, seriously, closely)
8
assiduously(adverb, thoroughly, seriously, closely)
7
strenuously(adverb, thoroughly, seriously, closely)
6
painstakingly(adverb, thoroughly, seriously, closely)
6
persistently(adverb, thoroughly, seriously, closely)
6
laboriously(adverb, earnestly, actively, hastily)
5
fervently(adverb, earnestly, actively, hastily)
5
zealously(adverb, earnestly, actively, hastily)
4
actively(adverb, energetically, industriously, conscientiously)
4
energetically(adverb, earnestly, actively, hastily)
4
perseveringly(adverb, earnestly, actively, hastily)
3
ardently(adverb, earnestly, actively, hastily)
3
busily(adverb, actively, energetically, intently)
3
studiously(adverb, earnestly, actively, hastily)
3
unremittingly(adverb, thoroughly, seriously, closely)
3
vigilantly(adverb, earnestly, actively, hastily)
2
arduously(adverb, earnestly, actively, hastily)
2
earnestly(adverb, thoroughly, closely, actively)
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APASmart Define. (2015). diligently thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/diligently/thesaurus/synonyms
ChicagoSmart Define. 2015. "diligently thesaurus" https://smartdefine.org/diligently/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, diligently thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/diligently/thesaurus/synonyms>.
MLASmart Define. "diligently thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/diligently/thesaurus/synonyms>