What does it indicate if someone is described as vigilant?

Describing someone as vigilant means they are carefully observant or attentive. This term conveys a sense of watchfulness and readiness, suggesting that the individual is alert to potential problems, dangers, or changes in their environment. A vigilant person is proactive, focused, and able to notice details that others might overlook, which is crucial in situations where awareness is key to safety or success.

In contrast, the other descriptions do not align with the meaning of vigilance. Being unaware of one's surroundings indicates a lack of attention, while being careless and negligent implies a disregard for responsibility and detail. Similarly, easily falling into distraction signifies an inability to maintain focus, which is directly opposite to being vigilant. Therefore, the emphasis on careful observation and attentiveness distinctly supports the choice that defines vigilance accurately.