Synonyms|5Antonyms|0|Broader|0Narrower|0Related|0
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costly
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deadly
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exterminatory(adjective, deadly, internecine)
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internecine
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mutually destructive
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APASmart Define. (1970). mutually harmful thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/mutually_harmful/thesaurus/synonyms
ChicagoSmart Define. 1970. "mutually harmful thesaurus" https://smartdefine.org/mutually_harmful/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 1970, mutually harmful thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/mutually_harmful/thesaurus/synonyms>.
MLASmart Define. "mutually harmful thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/mutually_harmful/thesaurus/synonyms>