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750 words
P/SAT / ACT Program

internecine

[in-ter-nee-seen, -sahyn, -nes-een, -nes-ahyn] [ˌɪntərˈnisin, -saɪn, -ˈnɛsin, -ˈnɛsaɪn]
adjective
  • mutually destructive; ruinous or fatal to both sides
  • "This conflict will undoubtedly prove internecine! For it will destroy us both."