Synonyms of 'internecine'
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
Something that is destructive causes or is capable of causing great damage, harm, or injury.
the awesome destructive power of nuclear weapons
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.