The antonyms for the word "re-activates" are terms that signify the opposite of turning on, restarting or reawakening. Some common antonyms for this word include deactivates, disables, shuts down, ceases, stops, and halts. The word "deactivates" means to turn off or render inactive. Similarly, "disables" implies the cessation of functioning. "Shut down" and "cease" both refer to the complete stopping of an activity. Lastly, "halts" suggests a sudden pause or cessation of activity. Thus, understanding antonyms for "re-activates" can provide a clearer understanding and context for the word.