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Preposition after adjective

Anonymous on, at, in, for or to?

Anonymous is often used without a following preposition, but anonymous to and anonymous in are common in specific meanings.

Quick answer

Which prepositions are used with anonymous?

Use anonymous to to mean unknown to someone. Use anonymous in for a context or group. Other prepositions usually belong to separate phrases rather than to anonymous itself.

The donor remained anonymous to the public.
She stayed anonymous in the large city.
The account was anonymous on social media.

Choose the pattern by meaning

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

1
anonymous to + person/group

Being unknown to someone

Use to when someone does not know the identity.

The writer was anonymous to readers.
2
anonymous in + place/group

Being unnoticed within a setting

In refers to the environment or group.

He felt anonymous in the crowd.
3
anonymous on + platform

Describing online identity

On introduces the platform, not the adjective complement.

Many users stay anonymous on forums.
4
anonymous for + reason

Explaining a purpose or motive

For may explain why anonymity exists.

The source remained anonymous for safety reasons.

See the difference in context

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

Construction
Example
Meaning
anonymous to
The artist remained anonymous to the press.
Unknown to a person or group.
anonymous in
She felt anonymous in the capital.
Not recognised within a setting.
anonymous on
He posted anonymous comments on the website.
On refers to the platform or location.
anonymous at
Anonymous at the event sounds unnatural in most contexts.
At is not a common complement after anonymous.
anonymous for
The witness stayed anonymous for security reasons.
For expresses a reason or purpose.

Common mistakes

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

Using at directly after anonymous

Anonymous at is usually not idiomatic as a fixed pattern.

✕ She was anonymous at her colleagues. ✓ She was anonymous to her colleagues.

Confusing to and in

To refers to people who do not know the identity; in refers to a setting.

✕ He was anonymous to the crowd. ✓ He was anonymous in the crowd.

Forgetting that on can be an adjunct

On often refers to a platform, not a complement selected by anonymous.

✕ The standard form is anonymous on. ✓ Users can remain anonymous on the platform.

Quick practice

Choose the expression that matches the intended meaning.

1. The donor stayed anonymous ___ the media.
2. She felt anonymous ___ the huge city.
3. Many people remain anonymous ___ the internet.

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Frequently asked questions

Can anonymous be used without a preposition?

Yes. For example: The caller remained anonymous.

Is anonymous to common?

Yes. It means someone's identity is unknown to another person or group.

Why do we say anonymous on the internet?

On refers to the platform or medium, not directly to the adjective anonymous.

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