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vigilant (B2)

adjective

Pronunciation: /ˈvɪdʒɪlənt/

Keeping careful watch for possible danger or difficulties.

The vigilant homeowner installed cameras to monitor his property.
Parents must be vigilant about what their children access online.
Remaining vigilant during the night watch, the soldier spotted the approaching enemy.

vigilant against (prepositional phrase): Keeping watch to protect from something bad. — "We must be vigilant against misinformation."
vigilant in (prepositional phrase): Being watchful while performing an action or duty. — "He was vigilant in his duties as a lifeguard."

Words with a similar meaning to vigilant:

Words with the opposite meaning to vigilant: