Sufficiently observing or befitting accepted social usages; polite:
Causing danger; ready to do harm or injury.
Suggestive of death:
Find another word for internecine. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for internecine, like: internal, civil, fratricidal, exterminatory, mutually destructive, murderous, domestic, dangerous and deadly.