The word "inactivate" usually refers to the act of rendering something inactive or dormant. The antonyms of "inactivate" include activate, energize, spark, stimulate, invigorate, animate, awaken, and revive. These words describe the opposite effect of "inactivate," as they all refer to making something active or lively. By activating an object, it becomes ready for use or operation, and by energizing it, its performance enhanced. Similarly, an individual can be revived after fainting by stimulating their senses. Thus, the antonyms of "inactivate" are necessary for describing a more dynamic and energetic state of things.