The phrase "wert watchful" implies being alert, attentive, and cautious. Therefore, its antonyms would be all those words that convey the opposite meaning of being watchful or alert, such as careless, inattentive, ignorant, oblivious, negligent, rash, reckless, and thoughtless. Being careless means paying little attention to details, while inattentive means not giving your full attention to something. Ignorant implies a lack of knowledge and understanding. Oblivious means not aware of what is happening around you. Negligent means failing to take proper care or pay attention to details. Rash and reckless imply acting without consideration or caution, and thoughtless means acting without thinking about the consequences.