- keenly watchful to detect danger; wary: a vigilant sentry.
- ever awake and alert; sleeplessly watchful.
Origin of vigilant
SynonymsSee more synonyms for vigilant on Thesaurus.com
2. wide-awake, sleepless.
2. See alert.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- keenly alert to or heedful of trouble or danger, as while others are sleeping or unsuspicious
C15: from Latin vigilāns keeping awake, from vigilāre to be watchful; see vigil
Word Origin and History for hypervigilant
late 15c., from Latin vigilantia "wakefulness," from vigilia (see vigil). Related: Vigilantly.
Online Etymology Dictionary, © 2010 Douglas Harper