Antonyms for the phrase "watching step" could include careless, reckless, inattentive, negligent, or indifferent. When someone is not "watching their step," they may be prone to accidents and mistakes, such as tripping, falling, or stumbling. Not paying attention to one's surroundings can also lead to missed opportunities or hazards, such as walking into traffic or running into obstacles. Conversely, being cautious, alert, and vigilant can help prevent accidents and ensure safety. Therefore, it is crucial to always be mindful and vigilant, especially when navigating unfamiliar or hazardous environments.