Defined: not assailable; specif., that cannot be successfully attacked or assaulted, that cannot be successfully denied ADJECTIVE
(Webster’s New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.)
The tenet that no nation should use chemical or biological weapons on their own people or on another country, even in wartime, is unassailable. And pursuant to the 1925 Geneva Protocol no nation has used such weapons in war. But this covenant does not include language barring using gas weapons on a country’s own people.