The word un-alert refers to a state of being unaware or unprepared. The antonyms for this word would include terms such as alert, vigilant, watchful, attentive, and cautious. These words describe people who are well-prepared and ready to face any challenge that might arise. They are always on their toes, ready to act quickly and decisively. Being alert and watchful is an essential trait that can help a person to stay safe, avoid accidents, and make wise decisions. So, it's always better for individuals to stay alert and attentive, rather than being un-alert and unprepared.