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Definition of vigilant:

  1. Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary.

Synonyms:

nimble, keenly aware, argus-eyed, on the ball, wakeful, lynx-eyed, keen-sighted, waking, alert, active, open-eyed, prompt, wide-awake, on the watch, hawk-eyed, study at watchful, light, wary, sharp-sighted, lively, quick-sighted, watchful, hustling, brisk, awareness.

Usage examples: