3
unremittingly(adverb, thoroughly, fully, completely, vigorously)
2
backwards and forwards(expression, idiom, adverb, detail, fully)
2
busily(adverb, actively, intently)
2
conscientiously
2
eagerly(adverb, vigorously, earnestly, actively, hastily)
2
fervently(adverb, vigorously, earnestly, actively, hastily)
2
hardly
2
intensively(adverb, very, thoroughly, fully, completely)
2
meticulously
2
mightily
2
resolutely
2
untiringly(adverb, thoroughly, closely, sharply, meticulously)
2
vigorously(adverb, earnestly, actively, hastily, carefully)
2
zealously(adverb, vigorously, earnestly, actively, hastily)
1
actively intently(expression, adverb, vigorously, earnestly, hastily)
1
agilely(adverb, vigorously, earnestly, actively, hastily)
1
all
1
animatedly(adverb, vigorously, earnestly, actively, hastily)
1
anxiously
1
ardently(adverb, vigorously, earnestly, actively, hastily)
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APASmart Define. (2016). assiduously thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/assiduously/thesaurus/synonyms
ChicagoSmart Define. 2016. "assiduously thesaurus" https://smartdefine.org/assiduously/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, assiduously thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/assiduously/thesaurus/synonyms>.
MLASmart Define. "assiduously thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/assiduously/thesaurus/synonyms>