• vigilant guard – бдительный страж
• vigilant person – бдительный человек
Please remain vigilant at all times and report anything suspicious. (Longman Dictionary of Contemporary English)
He was caught at the Turkey-Syria border by a vigilant guard but could very easily have become the latest Western citizen to join the Islamic militants. (BBC News)
More so, when someone is described as a vigilant person, they are very careful to notice anything out of place or amiss. (The Content Authority)
• vigilant
