9
destructive(adjective, harmful, injurious, damaging, fatal)
8
deadly(adjective, harmful, killing, injurious, damaging)
7
lethal(adjective, violent, cruel, harmful, killing)
6
fatal(adjective, violent, cruel, harmful, killing)
5
internal
5
harmful(adjective, violent, cruel, injurious, damaging)
5
mortal(adjective, violent, cruel, harmful, killing)
5
pernicious(adjective, violent, cruel, harmful, injurious)
4
malignant(adjective, injurious, damaging, destructive, fatal)
4
domestic
3
baneful(adjective, violent, cruel, harmful, injurious)
3
bloody
3
catastrophic(adjective, harmful, injurious, damaging, deadly)
3
deathful
3
devastating(adjective, harmful, injurious, damaging, deadly)
3
killing
3
murderous(adjective, injurious, damaging, destructive, fatal)
3
mutually destructive(expression, adjective, idiom, harmful)
3
sanguinary
3
suicidal(adjective, violent, cruel, harmful, killing)
<123457>
11 years ago|3.9k views|share |citing 
APASmart Define. (2015). internecine thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/internecine/thesaurus/synonyms
ChicagoSmart Define. 2015. "internecine thesaurus" https://smartdefine.org/internecine/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, internecine thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/internecine/thesaurus/synonyms>.
MLASmart Define. "internecine thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/internecine/thesaurus/synonyms>