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vigilant

[vij-uh-luh nt]
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adjective
  1. keenly watchful to detect danger; wary: a vigilant sentry.
  2. ever awake and alert; sleeplessly watchful.

Origin of vigilant

1470–80; < Latin vigilant- (stem of vigilāns), present participle of vigilāre to be watchful. See vigil, -ant
Related formsvig·i·lant·ly, adverbvig·i·lant·ness, nounhy·per·vig·i·lant, adjectivehy·per·vig·i·lant·ly, adverbhy·per·vig·i·lant·ness, nounnon·vig·i·lant, adjectivenon·vig·i·lant·ly, adverbnon·vig·i·lant·ness, nounpre·vig·i·lant, adjectivepre·vig·i·lant·ly, adverbsu·per·vig·i·lant, adjectivesu·per·vig·i·lant·ly, adverbun·vig·i·lant, adjectiveun·vig·i·lant·ly, adverb
Can be confusedvigilant vigilante

Synonyms

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2. wide-awake, sleepless.

Synonym study

2. See alert.

Antonyms

1. careless.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for hypervigilant

vigilant

adjective
  1. keenly alert to or heedful of trouble or danger, as while others are sleeping or unsuspicious
Derived Formsvigilantly, adverbvigilantness, noun

Word Origin

C15: from Latin vigilāns keeping awake, from vigilāre to be watchful; see vigil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for hypervigilant

vigilant

adj.

late 15c., from Latin vigilantia "wakefulness," from vigilia (see vigil). Related: Vigilantly.

Online Etymology Dictionary, © 2010 Douglas Harper

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