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 13 synonyms, antonyms, idiomatic expressions, and related words for internecine, like: internal, mutually destructive, civil, fratricidal, exterminatory, murderous, domestic, dangerous, deadly, and factional.