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On the alert, as for danger or error; watchful. See Synonyms at careful.

[Middle English, from Old French, from Latin vigilāns, vigilant-, present participle of vigilāre, to be watchful; see vigilante.]

vig′i·lant·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.vigilantly - in a watchful mannervigilantly - in a watchful manner      
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˈvɪdʒɪləntlɪ] ADVvigilantemente
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


advaufmerksam; patrolwachsam
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in classic literature ?
It was not to be expected that our travellers could pass unseen through a region thus vigilantly sentineled; accordingly, in the edge of the evening, not long after they had encamped at the foot of the Bighorn Sierra, a couple of wild-looking beings, scantily clad in skins, but well armed, and mounted on horses as wild- looking as themselves, were seen approaching with great caution from among the rocks.
Each day he spent from an hour to two hours in the cage, watching the rehearsing, with nothing for him and Jack to do save stand vigilantly on guard.
Why didn't they search more vigilantly? they would have found" --
Reach not after morality and righteousness, my friends; watch vigilantly your stomach, and diet it with care and judgment.
How lucky I am!' to attract the attention and envy of my neighbours--I am merely passive; but when events fall out ill --when circumstances become adverse--I watch very vigilantly; I knit on still, and still I hold my tongue; but every now and then, monsieur, I just put my toe out--so--and give the rebellious circumstance a little secret push, without noise, which sends it the way I wish, and I am successful after all, and nobody has seen my expedient.
The man who travelled, loud-stepping, the direct line to the cabin door, he let alone--though he watched him vigilantly until the door opened and he received the endorsement of the master.
But, eyes no less rapacious had watched the growth of the Mounds in years bygone, and had vigilantly sifted the dust of which they were composed.
She at once set it down as a falsehood, and returned to her own window to keep watch over North Shingles more vigilantly than ever.
No company, a walk, a family dinner of four, and an evening of looking over books and pictures; Miss Murdstone with a homily before her, and her eye upon us, keeping guard vigilantly. Ah!
There was no time to inquire to what this exclamation, which was delivered in a very rapturous tone, referred; for he had already thrown open the door of the room; into which Nicholas, followed by Smike with the bundle on his shoulder (he carried it about with him as vigilantly as if it had been a sack of gold), straightway repaired.
"The fire has not been idle," returned the trapper, keeping his eye vigilantly employed in profiting by those glimpses of the horizon, which the whirling smoke offered to his examination.
He shuffled athwart, keeping one eye ahead vigilantly. 'Don't be too sure,' he continued.'The other day I took up a man who hanged himself on the road.