very careful to notice any signs of danger or trouble警觉的；警惕的；警戒的；谨慎 synonym alert, watchful- A pilot must remain vigilant at all times.飞行员必须随时保持警惕。🔊🔊
- The thief was spotted by vigilant neighbours.小偷被警惕的邻居发现。
- The organization is ever vigilant for threats to the habitats of birds.该组织对鸟类栖息地所面临的种种威胁始终保持警惕。
- You need to be vigilant against garden pests.你要警惕花园里的害虫。
Oxford Collocations DictionaryverbsadverbprepositionSee full entry Word Originlate 15th cent.: from Latin vigilant- ‘keeping awake’, from the verb vigilare, from vigil ‘awake’.