Synonyms|73Antonyms|6|Broader|0Narrower|0Related|45
7
diabolically(adverb, extremely, horribly, hellishly, satanically)
5
cruelly(adverb, pitilessly)
5
devilishly(adverb, satanically)
4
hellishly(adverb, extremely, horribly, pitilessly)
4
satanically(adverb, satanically)
3
atrociously
2
badly
2
brutally(adverb, pitilessly)
2
deucedly
2
evilly
2
ferociously
2
infernally(adverb, horribly, hellishly)
2
madly(adverb, crazily)
2
mercilessly(adverb, pitilessly)
1
barbarically(adverb, pitilessly)
1
bloodthirstily(adverb, pitilessly)
1
crazily(adverb, crazily)
1
deadly
1
demoniacally
1
demoniacly
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APASmart Define. (2015). fiendishly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/fiendishly/thesaurus/synonyms
ChicagoSmart Define. 2015. "fiendishly thesaurus" https://smartdefine.org/fiendishly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, fiendishly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/fiendishly/thesaurus/synonyms>.
MLASmart Define. "fiendishly thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/fiendishly/thesaurus/synonyms>