- keenly watchful to detect danger; wary: a vigilant sentry.
- ever awake and alert; sleeplessly watchful.
Origin of vigilant
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for vigilant
Nervous fans can keep a vigilant eye on it via a webcam hosted on the town website that offers 24-hour goat viewing.Sweden’s Burning Christmas Goat
December 25, 2014
They washed their hands methodically under the vigilant eye of Fatu.The Life of a Liberian Child with Ebola
November 5, 2014
A vigilant tourist snapped a picture on her cellphone and showed guards who caught the kids before they could escape.Pompeii Made It Through a Volcano, but Can It Survive Vandals?
Barbie Latza Nadeau
March 22, 2014
Bieber tried to sneak out of the house, covering himself in a sheet, but vigilant photographers caught him in the act.Justin Bieber’s No Good, Very Bad Year: Alleged Prostitutes, Reckless Driving, and More
December 13, 2013
Nairobi residents receive alerts and warnings from embassies on a monthly sometimes-weekly basis telling them to be vigilant.Slaughter in Nairobi: Bloody Siege in Shopping Mall Kills Dozens
September 22, 2013
Robert's suspicions were lulled to sleep, and he ceased to be as vigilant and watchful as he had been.Brave and Bold
But these are not the only points to which you look for vigilant watchfulness.
Do you watch over their conduct with a vigilant and paternal eye?Female Scripture Biographies, Vol. II
Francis Augustus Cox
But the wary and vigilant leader of the Hurons was not so easily disconcerted.The Last of the Mohicans
James Fenimore Cooper
The police, too, were set at work,—the vigilant police of Paris!Alice, or The Mysteries, Complete
- keenly alert to or heedful of trouble or danger, as while others are sleeping or unsuspicious
Word Origin and History for vigilant
late 15c., from Latin vigilantia "wakefulness," from vigilia (see vigil). Related: Vigilantly.