Being negligent implies a lack of care or attention towards something or someone. Its antonyms are closely related to opposite meanings such as responsible, attentive, cautious, vigilant, diligent, and careful. Being responsible means being accountable and reliable, while being attentive implies being focused and paying close attention to details. Cautious means being careful and avoiding risks, while vigilant implies staying alert and watchful. Diligent means being hardworking, while careful implies taking care to avoid mistakes or mishaps. All of these words represent the opposite of being negligent and show a high level of care, attention, and responsibility.