32 entries under vigorously topic. ×

5
severely(adverb, fast, sprightly, intensely, fiercely)
4
rigorously(adverb, fast, sprightly, severely, seriously)
3
earnestly(adverb, fast, sprightly, seriously, intensely)
3
energetically(adverb, fast, sprightly, seriously, intensely)
2
intensely(adverb, fast, sprightly, severely, seriously)
2
seriously(adverb, fast, sprightly, severely, intensely)
1
actively(adverb, fast, sprightly, severely, seriously)
1
angrily(adverb, fast, sprightly, severely, seriously)
1
animatedly(adverb, fast, sprightly, seriously, intensely)
1
boisterously(adverb, fast, sprightly, severely, seriously)
1
briskly(adverb, fast, sprightly, seriously, intensely)
1
forcibly(adverb, fast, sprightly, severely, seriously)
1
frantically(adverb, fast, sprightly, severely, seriously)
1
furiously(adverb, fast, sprightly, severely, seriously)
1
heavily(adverb, fast, sprightly, severely, seriously)
1
keenly(adverb, fast, sprightly, severely, seriously)
1
madly(adverb, fast, sprightly, severely, seriously)
1
painfully(adverb, fast, sprightly, severely, seriously)
1
powerfully(adverb, fast, sprightly, severely, seriously)
1
roughly(adverb, fast, sprightly, severely, seriously)
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APASmart Define. (2016). relentlessly thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/relentlessly/thesaurus/synonyms
ChicagoSmart Define. 2016. "relentlessly thesaurus" https://smartdefine.org/relentlessly/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, relentlessly thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/relentlessly/thesaurus/synonyms>.
MLASmart Define. "relentlessly thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/relentlessly/thesaurus/synonyms>