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Definition/Meaning

(adjective)

careful and alert, watching attentively (and often constantly) in order to avoid unexpected difficulties or danger;

e.g. The vigilant neighbors saved the residence from burglary.

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Similar Words

Argus-eyed

Attentive

Awake

Heads-up

Hyperconscious

Observant

Open-eyed

Tiptoe

Watchful

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Opposite Words

Absent

Absentminded

Absorbed

Abstracted

Asleep

Dazed

Derelict

Distracted

Dreamy

Faraway

Forgetful

Inattentive

Incautious

Insensible

Lackadaisical

Languid

Languorous

Lax

Lazy

Limp

Listless

Mindless

Neglectful

Negligent

Oblivious

Preoccupied

Remiss

Slack

Slipshod

Spiritless

Unaware

Unconscious

Unfocused

Unguarded

Unmindful

Unprepared

Unready

Unsafe

Unthinking

Unwitting

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Related Words

Agape

Agog

Alert

Alive

Apprehensive

Aware

Chary

Circumspect

Clear-sighted

Cognizant

Conscientious

Conscious

Conservative

Considerate

Expectant

Fussy

Gingerly

Heedful

Hip

Hypervigilant

Keen

Loving

Meticulous

Mindful

Painstaking

Prepared

Ready

Safe

Scrupulous

Sensible

Sensitive

Sentient

Sharp

Sharp-eyed

Sharp-sighted

Sleepless

Wakeful

Ware

Wise

Witting

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