3
banefully
2
balefully
2
deleteriously
2
destructively
2
detrimentally
2
fatally
2
harmfully
2
hurtfully
2
injuriously
2
insidiously
2
malignantly
2
malignly
2
mischievously
2
noxiously
2
pestilently
2
ruinously
1
badly
1
dangerously
1
deadly
1
disadvantageously
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APASmart Define. (2013). perniciously thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/perniciously/thesaurus/synonyms
ChicagoSmart Define. 2013. "perniciously thesaurus" https://smartdefine.org/perniciously/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, perniciously thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/perniciously/thesaurus/synonyms>.
MLASmart Define. "perniciously thesaurus" 16 June 2013. Web. 21 September 2026. <https://smartdefine.org/perniciously/thesaurus/synonyms>