Synonyms of 'internecine'
destructiveDictionary, bloody, deadly
The episode has turned attention to the internecine strife here.
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If something is deadly, it is likely or able to cause someone's death, or has already caused someone's death.
a deadly disease currently affecting dolphins
A fatal accident or illness causes someone's death.
She had suffered a fatal heart attack.
Thesaurus for internecine from the Collins English Thesaurus
An internecine conflict, war, or quarrel is one which takes place between opposing groups within a country or organization.