internecine
Syllabification: (in·ter·ne·cine)
Pronunciation: /ˌintərˈnesēn, -ˈnēsēn, -sin/
Definition of internecine
adjective
Origin:
mid 17th century (in the sense 'deadly, characterized by great slaughter'): from Latin internecinus, based on inter- 'among' + necare 'to kill'