14
ferociously(adverb, terrible, fast, sprightly, severely)
13
furiously(adjective, adverb, strong, fast, sprightly)
11
wildly(adjective, adverb, fast, sprightly, severely)
9
violently(adjective, adverb, fast, sprightly, severely)
9
intensely(adjective, adverb, fast, sprightly, severely)
8
cruelly(adverb, fast, sprightly, severely, seriously)
8
brutally(adverb, terrible, fast, sprightly, severely)
8
grimly(adverb, in awful way)
7
excitedly(intensely, powerfully, hastily, wildly, impulsively)
7
savagely(adverb, fast, sprightly, severely, intensely)
6
atrociously(adverb, terrible, in awful way)
6
frantically(adjective, adverb, strong, fast, sprightly)
6
vehemently(adverb, violently)
5
barbarically(adverb, terrible, in awful way)
5
barbarously(adverb, terrible, in awful way)
5
ferally(adverb, terrible, in awful way)
5
madly(adjective, adverb, fast, sprightly, severely)
4
angrily(adverb, fast, sprightly, severely, intensely)
4
desperately(intensely, wildly)
4
impetuously
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APASmart Define. (2016). fiercely thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/fiercely/thesaurus/synonyms
ChicagoSmart Define. 2016. "fiercely thesaurus" https://smartdefine.org/fiercely/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, fiercely thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/fiercely/thesaurus/synonyms>.
MLASmart Define. "fiercely thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/fiercely/thesaurus/synonyms>