It's interesting; for internecine that's what I had always used as the definition as well. However, the OED only lists two definitions: 1. orig. Deadly, destru

It's interesting; for internecine that's what I had always used as the definition as well. However, the OED only lists two definitions: 1. orig. Deadly, destructive, characterized by great slaughter. internecine war, war for the sake of slaughter, war of extermination, war to the death. 2. esp. (In modern use.) Mutually destructive, aiming at the slaughter or destruction of each other. And a non-obvious etymology: [ad. L. internecn-us murderous, destructive, f. internecium slaughter, destruction, f. internecre: see next. App. first used as a rendering of L. internecnum bellum, in Butler's Hudibras (to which also is due the unetymological pronunciation, instead of interncine). On this authority entered by Johnson in his Dictionary, with an incorrect explanation, due to association with words like interchange, intercommunion, etc. in which inter- has the force of ‘mutual’, ‘each other’. From J. the word has come into later dictionaries and 19th c. use, generally in the Johnsonian sense.] (And 'baldenfreud' is a bit out of place on a list like this; a neologism if I've ever heard one.)