The word "negligent" means being careless or failing to take proper care. Its opposite, or antonym, is "attentive", which means being diligent, watchful, and paying attention to details. Some other antonyms for "negligent" are conscientious, careful, meticulous, attentive, responsible, and cautious. When you are attentive, you are alert and cautious, making sure you are doing everything with precision and care. Being conscientious means being responsible and taking care of your duties with great care and diligence. Using antonyms for the word "was negligent" can help express actions or conduct that are opposite and more fitting for a specific scenario or circumstance.