The antonyms for the word "in activate" are quite straightforward. The word "activate" means to make something active, effective or operative. Therefore, its antonyms involve the opposite actions of halting, disabling, deactivating or disengaging. When we inactivate a device or system, we switch it off or shut it down to prevent any further operations. Similarly, when we disable something, we render it inoperative or incapable of performing any functions. Conversely, activating a device or system refers to turning it on or enabling it to work. So, when we activate something, we make it functional and operational.