- adj. 警戒的；警惕的
carefully observant or attentive; on the lookout for possible danger;
"a policy of open-eyed awareness"
"the vigilant eye of the town watch"
"there was a watchful dignity in the room"
"a watchful parent with a toddler in tow"
- We must keep an vigilant eye upon imperialism.
- A pilot must be vigilant at all times.
- The night shift has to be doubly vigilant.
- The British Prime Minister Gordon Brown has urged people to be vigilant against the potential terrorist attack.
He had been a vigilant and faithful watchdog of the state's interest.出自： S. Naipaul