When you do something vigilantly, you do it with a great deal of care and watchfulness. Your dog might vigilantly guard her special bone, growling a little when the cat walks too close to it.

Doing things vigilantly means acting with attentiveness. The adverb should make you think of a night watchman vigilantly watching a security camera or a Great Pyrenees vigilantly protecting a flock of sheep from predators. The adverb comes from its related adjective, vigilant, or "keeping careful watch." The Latin root of both words is vigilantia, or "wakefulness."

Definitions of vigilantly
  1. adverb
    in a watchful manner
    synonyms: watchfully
Word Family