What does it mean to be "vigilant"?

Being "vigilant" means to be carefully observant or attentive, especially in keeping watch for potential dangers or problems. This term suggests a high level of alertness, where an individual is not only aware of their surroundings but is actively watching for any signs that something unusual might occur. Vigilance is important in various contexts such as safety, security, or even during tests or tasks where maintaining focus is essential.

In contrast, the other options depict states of mind or behavior that are not aligned with the concept of vigilance. Being easily distracted implies a lack of focus; being unconcerned suggests indifference or a lack of attention altogether; and being forgetful indicates a failure to retain information or pay attention. None of these alternatives captures the essence of being alert and mindful, which is the core definition of being vigilant.