internecine
Pronunciation:
/-sɪn//ˌɪntɚˈnisin/adjective
Definitions
Mutually destructive; most often applied to warfare.
Example: Internecine strife in Gaza claimed its most senior victim yesterday.
Characterized by struggle within a group, usually applied to an ethnic or familial relationship.
Example: The Mongol people were plagued by internecine conflict until Genghis Khan unified them.