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vigilant (adj) careful and watchful for any signs of danger.
When you are vigilant you are very watchful and careful so that you can see any signs of danger. You are vigilant if you are very watchful so that you notice anything dangerous. Security guards, soldiers in times of war and police must always be vigilant. That is, they must be watchful enough to see nothing dangerous happens, or no enemy enters.
- As the guards were very vigilant, it was not possible for the enemy to enter the army camp and plant bombs there. The guards were very watchful and were keen enough to notice any sign of trouble or danger.
- The commander found the soldiers quiet vigilant. He was satisfied that the soldiers in the watch posts were very watchful and their eyes were all over the place to notice any sign of danger or the enemy trying to enter the place.