8
atrociously(adverb, terrible, in awful way)
6
demoniacally(adverb, terrible, in awful way)
6
devilishly(adverb, satanically)
6
ferociously(adverb, terrible, in awful way)
6
fiendishly(adverb, extremely, horribly, hellishly, satanically)
5
hellishly(adverb, extremely, horribly, hellishly)
5
infernally(adverb, horribly, hellishly)
4
brutally(adverb, terrible, in awful way)
4
satanically(adverb, satanically)
3
barbarically(adverb, terrible, in awful way)
3
barbarously(adverb, terrible, in awful way)
3
brutishly(adverb, terrible, in awful way)
3
cold-fistedly(adverb, terrible, in awful way)
3
cruelly(adverb, in awful way)
3
ferally(adverb, terrible, in awful way)
3
fiercely(adverb, terrible, in awful way)
2
In a cruelhearted way(adverb, terrible, in awful way)
2
demonically
2
deucedly
1
abysmally(adverb, hellishly)
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APASmart Define. (2016). diabolically thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/diabolically/thesaurus/synonyms
ChicagoSmart Define. 2016. "diabolically thesaurus" https://smartdefine.org/diabolically/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, diabolically thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/diabolically/thesaurus/synonyms>.
MLASmart Define. "diabolically thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/diabolically/thesaurus/synonyms>