vigilant
adj.adj. staying very careful and alert to notice any possible danger or problems. You use this when someone is watching a situation closely to keep things safe.
adj. keeping careful watch for possible danger or difficulties. Often used in contexts involving security, safety, or public health monitoring.
The security guard remains vigilant throughout the night.
Health officials urged the public to remain vigilant for symptoms as the new virus began to spread through the community.
In an era of sophisticated digital threats, users must be increasingly vigilant about the links they click and the personal information they share on social media platforms.
From French vigilant or its source, Latin vigilans, present participle of vigilare (“stay awake”), from vigil (“awake”). Doublet of vigilante, from Spanish. Displaced Old English wacor.
Often follows linking verbs such as 'remain', 'stay', or 'be'. Frequently paired with the preposition 'against' or 'for'.