Vivificating refers to giving life or energy to something, but its antonyms denote a lack of vitality or even death. Some antonyms for vivificating include killing, extinguishing, or deadening. Other possible antonyms include, weakening, dulling, numbing or reducing. Taking away energy or vigor from a system, entity or organism is an action that has damaging consequences as the opposite of vivifying. Words like depressing, sapping or deflating can also be used to express the opposite meaning of vivificating. Using antonyms to help clearly communicate the opposite or contrasting ideas within written or spoken language is a valuable tool for effective communication.