Negligence is a serious matter, and it's important to understand its opposite meaning. Some antonyms of "is negligent" include "is vigilant," "is attentive," "is responsible," "is diligent," "is meticulous," and "is careful." When someone is vigilant, they are always on the lookout for potential issues and take proactive steps to avoid them. Similarly, someone who is attentive is focused on the task at hand and takes care to avoid mistakes. A responsible person takes ownership of their actions and ensures that everything is done correctly, while someone who is diligent puts in a lot of effort to ensure that their work is done to the highest standards. Finally, a person who is meticulous pays close attention to detail to avoid any errors.