: carefully noticing problems or signs of danger
When traveling through the city, tourists should be extra vigilant.
They were vigilant about protecting their children.
We remain vigilant against theft.
a vigilant tourist/parent
Cite this Entry
“Vigilant.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/vigilant. Accessed 22 Jun. 2026.
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