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Preposition after adjective

Vigilant in vs vigilant about

Vigilant about is the common choice for risks or issues. Vigilant in refers to being careful in actions or duties.

Quick answer

Which preposition is used with vigilant?

Use vigilant about for dangers, problems, or areas of concern. Use vigilant in when describing careful behaviour in an activity or responsibility.

Parents should be vigilant about online safety.
The staff remained vigilant in checking visitor IDs.
Investors are vigilant about market changes.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
vigilant about + risk or issue

Watching carefully for problems

About introduces a danger, concern, or topic requiring attention.

Doctors are vigilant about signs of infection.
Consumers are becoming vigilant about data privacy.
2
vigilant in + activity

Being careful in actions or duties

In refers to the activity or behaviour where care is shown.

The editor was vigilant in checking facts.
Guards must remain vigilant in monitoring the entrance.
3
vigilant against + threat

Protecting against danger

Against is also common when the focus is defence from a threat.

The agency stays vigilant against cyberattacks.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
vigilant about
She is vigilant about food hygiene.
careful concerning a topic or risk
vigilant in
He was vigilant in enforcing the rules.
careful while performing an action
vigilant against
The company is vigilant against fraud.
alert to possible threats
vigilant of
They became vigilant of suspicious activity.
less common and more formal than about or against

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using in for a topic of concern

Use about for dangers or issues.

✕ They are vigilant in security risks. ✓ They are vigilant about security risks.

Using about before an action

Use in when describing careful performance of a task.

✕ She was vigilant about checking the reports. ✓ She was vigilant in checking the reports.

Overusing rare combinations

Vigilant of exists but is uncommon in everyday English.

✓ The team remained vigilant about possible delays.

Quick practice

Choose the expression that matches the intended meaning.

1. The school is vigilant ___ bullying.
2. She was vigilant ___ reviewing contracts.
3. The bank stays vigilant ___ fraud attempts.

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Frequently asked questions

Is vigilant about more common than vigilant in?

Yes. Vigilant about is widely used for concerns and risks.

Can I say vigilant against?

Yes. It is natural when discussing protection from threats or attacks.

Does vigilant in sound formal?

It can sound slightly formal because it often appears in professional or official contexts.

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