Red alert is a term used to indicate an emergency or a critical situation. Its antonyms are words that indicate no emergency, such as "all clear," "safe," and "secure." These words suggest that everything is under control and there is no reason to worry or panic. Other antonyms for red alert include "calm," "relaxed," "peaceful," "quiet," "tranquil," "stable," and "ordinary." These words signify a state of normalcy and suggest that there is no need for alarm. Although the antonyms for red alert may have different contexts, they all convey a sense of safety, peace, and calmness.