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Prepositions after adjectives

adamant about vs adamant in

Adamant about is the standard modern pattern. Adamant in appears mainly before actions or behaviour in formal writing.

Quick answer

Correct use of adamant

Use adamant about for opinions, decisions, or topics. Use adamant in mainly before behaviour or refusal in more formal contexts.

She was adamant about keeping the policy.
They remained adamant in their opposition.

Choose the pattern by meaning

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

1
adamant about + topic/decision

Strong opinion about something

This is the most common pattern.

He is adamant about quality control.
2
adamant in + behaviour/stance

Firm in behaviour

This pattern is more formal and less common.

The witness was adamant in denying the claim.

See the difference in context

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

Construction
Example
Meaning
adamant about
She is adamant about the deadline.
firmly decided about something
adamant in
They were adamant in refusing help.
firm in an action or stance
adamant on
He is adamant on this issue.
informal alternative to about

Common mistakes

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

Using in for general topics

About is usually more natural for opinions and decisions.

✕ She is adamant in the budget cuts. ✓ She is adamant about the budget cuts.

Using about before actions

In may fit better with behaviour in formal contexts.

✓ They were adamant in resisting change.

Quick practice

Choose the expression that matches the intended meaning.

1. He is adamant ___ leaving early.
2. They were adamant ___ refusing the offer.
3. Choose the most natural sentence.

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Frequently asked questions

Is adamant about the most common pattern?

Yes. It is the standard modern combination.

When is adamant in used?

It is used mainly in formal contexts describing firm behaviour or refusal.

Can I say adamant on?

Yes, especially in informal English, though about is usually preferred.

abhorrent-to-in-for-of, about "ablaze with" or "ablaze in"? "able for" or "able in"? "abreast of" or "abreast with"? "absent from" or "absent in"? absolute in, for, of, to or as? "absurd to", "absurd in" or "absurd for"? abundant in, with, of, on or for? "abusive to", "abusive in" or "abusive towards"? "academic in" or "academic at"? "acceptable to" or "acceptable for"? accessible to, by, for, from or in?

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