unoˈbligatory,a. (un-1 7.) 1802–12Bentham Ration. Judic. Evid. (1827) IV. 539 In causes non-criminal, obligatory at one stage, unobligatory at another.1851W. R. Greg Creed Christendom xiv. 208 If investigation shows the miracles of the Bible to be..unobligatory upon our belief.