vigilant









vigilant


adjective

  1. keenly watchful to detect danger; wary: a vigilant sentry.
  2. ever awake and alert; sleeplessly watchful.

adjective

  1. keenly alert to or heedful of trouble or danger, as while others are sleeping or unsuspicious
adj.

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

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