Simple Definition of vigilant
: carefully noticing problems or signs of danger
Full Definition of vigilant
: alertly watchful especially to avoid danger
Examples of vigilant
Over the years, as tension between pitchers and hit batsmen heightened to the point that hitters began rushing the mound, umpires have had to become far more vigilant about keeping the game from degenerating into a dogfight. —Buzz Bissinger, Sports Illustrated, 21 Mar. 2005
At the Château de Wideville's magnificent seventeenth-century gates, guests have their names ticked off by vigilant staff and then snake through a lugubrious park à l'anglaise. —Hamish Bowles, Vogue, September 2002
And as a foreign tourist in North Korea, under the care of vigilant minders who wanted me to see only the best, I had enjoyed the finest fare available. —Christopher Hitchens, Vanity Fair, January 2001
A vigilant hand had, as usual, kept the fire alive and the lamp trimmed; and the room, with its rows and rows of books, its bronze and steel statuettes of “The Fencers” on the mantelpiece and its many photographs of famous pictures, looked singularly home-like and welcoming. —Edith Wharton, The Age of Innocence, 1920
When traveling through the city, tourists should be extra vigilant.
They were vigilant about protecting their children.
We remain vigilant against theft.
Origin of vigilant
Middle English (Scots), from Latin vigilant-, vigilans, from present participle of vigilare to keep watch, stay awake, from vigil awake
First Known Use: 15th century
Synonym Discussion of vigilant
VIGILANT Defined for Kids
Definition of vigilant
: alert especially to avoid danger <… he was constantly vigilant, looking for the next nearest hiding place should the sound of engines come. — Lois Lowry, The Giver>
Seen and Heard
What made you want to look up vigilant? Please tell us where you read or heard it (including the quote, if possible).