5
meticulously(adverb, thoroughly, carefully, faithfully, fastidiously)
5
mindfully(adverb, thoroughly, carefully, faithfully, vigilantly)
5
zealously(adverb, vigorously, earnestly, actively, hastily)
4
actively(adverb, vigorously, energetically, industriously, conscientiously)
4
cautiously(adverb, vigilantly, attentively)
4
energetically(adverb, vigorously, earnestly, actively, hastily)
4
perseveringly(adverb, vigorously, earnestly, actively, hastily)
4
relentlessly(adverb, resolutely)
4
resolutely(adverb, resolutely, tenaciously)
4
tenaciously(adverb, resolutely, tenaciously)
4
thoughtfully(adverb, thoroughly, seriously, intensely, carefully)
4
unflaggingly(adverb, tenaciously)
4
untiringly(adverb, thoroughly, closely, meticulously, determinedly)
3
ardently(adverb, vigorously, earnestly, actively, hastily)
3
busily(adverb, vigorously, actively, energetically, intently)
3
determinedly(adverb, resolutely, tenaciously)
3
heartily(adverb, resolutely, tenaciously)
3
loyally(adverb, resolutely)
3
scrupulously(adverb, thoroughly, carefully, meticulously, faithfully)
3
studiously(adverb, vigorously, earnestly, actively, hastily)
11 years ago|4.9k views|share |citing 
APASmart Define. (2015). diligently thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/diligently/thesaurus/synonyms
ChicagoSmart Define. 2015. "diligently thesaurus" https://smartdefine.org/diligently/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, diligently thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/diligently/thesaurus/synonyms>.
MLASmart Define. "diligently thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/diligently/thesaurus/synonyms>