50 entries under fiercely topic. ×

19
seriously(adverb, fast, badly, completely, intensely)
11
intensely(adverb, fast, very, sprightly, really)
8
rigorously(adverb, fast, just, absolutely, sprightly)
8
cruelly(adverb, fast, sprightly, seriously, intensely)
8
hard(adverb, fast, intensely, violently)
8
painfully(adverb, fast, badly, sprightly, intensely)
8
roughly(adverb, fast, badly, sprightly, intensely)
8
sharply(adverb, fast, very, sprightly, intensely)
8
violently(adverb, fast, very, sprightly, really)
6
brutally(adverb, fast, sprightly, intensely)
5
furiously(adverb, fast, greatness, sprightly, intensely)
5
heavily(adverb, fast, sprightly, seriously, intensely)
5
savagely(adverb, fast, sprightly, intensely)
4
keenly(adverb, fast, very, sprightly, intensely)
4
relentlessly(adverb, fast, sprightly, intensely)
3
earnestly(adverb, fast, seriously, intensely)
3
ferociously(adverb, fast, sprightly, intensely)
3
frantically(adverb, fast, sprightly, intensely)
3
madly(adverb, fast, sprightly, intensely)
3
tightly(adverb, fast, thoroughly, intensely)
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APASmart Define. (2015). severely thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/severely/thesaurus/synonyms
ChicagoSmart Define. 2015. "severely thesaurus" https://smartdefine.org/severely/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, severely thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/severely/thesaurus/synonyms>.
MLASmart Define. "severely thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/severely/thesaurus/synonyms>