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vigilant

/ˈvɪdʒɪlənt//ˈvɪdʒɪlənt/·adjective
keeping careful watch for possible danger or problems
Fig. 1 — A lighthouse beam sweeps the dark in slow, even arcs while the small ones sleep below it.
01Definition

Vigilant means awake while others sleep — from the Latin vigilare, 'to keep watch'. The vigilant lifeguard, auditor, or immune system is defined by what usually doesn't happen: the drowning prevented, the fraud caught early, the infection stopped at the gate. Vigilance looks like boring routine for hours and proves itself in a single second; the word always implies sustained attention paid before anything has gone wrong.

02In use
  • iLifeguards must remain vigilant even in calm water, alert to the subtle signs of a swimmer in trouble.
  • iiRegulators urge banks to stay vigilant against fraud schemes that quickly adapt to each new safeguard.
  • iiiThanks to a vigilant neighbor, the fire was reported within minutes.
03Collocations
  • remain vigilant
  • stay vigilant against
  • a vigilant eye
  • vigilant monitoring

Family vigilance (noun) · vigilantly (adverb)

04Relations

=watchful, alert, attentive, wary, observant

≠careless, inattentive, off guard

05Compared
PairThe difference
vigilant vs cautiouscareful and risk-avoiding in your own actions → cautious; alert and watching outward for danger → vigilant.
vigilant vs diligentsteady care poured into your own work → diligent; steady watch kept against outside danger → vigilant.
vigilant vs dormantalert and on guard → vigilant; quiet but able to wake → dormant.
06TOEFL & IELTS

Frequent in IELTS reading and listening on safety, health, and security — and 'remain/stay vigilant' is the collocation officials use in every public warning, making it natural for essays on crime or online privacy. TOEFL passages apply it to immune systems and sentinel animals. Noun: vigilance; do not confuse with 'vigilante', someone who enforces the law themselves.

07Asked
What does 'stay vigilant' mean?
To keep watching for danger and not let your guard down — the exact phrase officials reach for in public warnings about fraud, crime or disease. Vigilant means keeping careful watch before anything has gone wrong, from Latin vigilare, 'to keep watch'. The scene above is the quality exactly — a lighthouse beam sweeping in calm, even arcs, that snaps straight onto the one intruder and holds it in the light while the sleepers below never know.
What is the difference between vigilant and alert?
Alert is general readiness — awake and quick to notice anything. Vigilant is narrower and more sustained: watchful specifically for danger, over a long stretch, before it appears. You are alert when the phone rings; you are vigilant for hours guarding against a threat that may never come. Alert reacts to what happens; vigilant watches for what might.
What does vigilant mean?
Keeping careful watch for possible danger before anything has gone wrong. The vigilant lifeguard or auditor is defined by what usually doesn't happen: the drowning prevented, the fraud caught early. Its force is endurance — the hard part is holding attention through long stretches when nothing happens, which is exactly when lapses occur. Vigilance looks like boring routine for hours and proves itself in a single second.
What does 'hypervigilant' mean?
Excessively watchful — vigilance turned up so high it becomes a strain, scanning constantly for threats even when none are present. The hyper- prefix marks the excess: where vigilance is healthy watchfulness, hypervigilance is exhausting over-alertness, a term used in psychology for a heightened, draining state of guard. The everyday sense is milder — someone hypervigilant about tiny errors checks far more than the task requires.
How do you pronounce vigilant?
VIJ-uh-lunt — three syllables, stress firmly on the first, the g soft like the j in 'jam'. The common slip is a hard g ('VIG-') or a stressed second syllable. Its noun, vigilance, keeps the same soft g and front stress: VIJ-uh-lunce. British and American English agree on the pattern, so it is a safe word to say aloud once you fix the soft g.