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Prepositions after adjectives

Sincere in vs. sincere about

Both sincere in and sincere about are correct, but they are used differently. Sincere in focuses on actions or behaviour, while sincere about focuses on a topic or feeling.

Quick answer

When do we use sincere in or sincere about?

Use sincere in before actions, efforts, or behaviour. Use sincere about before a subject, feeling, or intention.

She was sincere in her apology.
He seems sincere about helping the team.
They were sincere in their efforts.

Choose the pattern by meaning

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

1
sincere in + noun

Talking about actions or behaviour

Use sincere in with acts, attempts, or conduct.

The manager was sincere in his support.
She was sincere in her promise.
2
sincere about + topic

Talking about feelings or intentions

Use sincere about when referring to a subject or concern.

He is sincere about improving relations.
They were sincere about the project goals.
3
sincere with + person

Being honest with someone

Use sincere with to mention the person receiving the honesty.

Please be sincere with your clients.

See the difference in context

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

Construction
Example
Meaning
sincere in
She was sincere in her apology.
Focuses on the genuineness of an action or expression.
sincere about
He is sincere about changing the policy.
Focuses on a topic, intention, or feeling.
sincere with
Be sincere with your audience.
Refers to honest behaviour toward someone.

Common mistakes

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

Using sincere in before a topic

About is often more natural for topics or plans.

✕ She is sincere in climate action. ✓ She is sincere about climate action.

Using sincere about before an action noun awkwardly

In is usually better with apologies, efforts, and promises.

✕ He was sincere about his apology. ✓ He was sincere in his apology.

Quick practice

Choose the expression that matches the intended meaning.

1. She was sincere ___ her apology.
2. They seem sincere ___ solving the problem.
3. Always be sincere ___ your customers.

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Frequently asked questions

Is sincere in correct?

Yes. It is common with actions such as apologies, promises, and efforts.

Can I use sincere about feelings?

Yes. Sincere about often introduces intentions, beliefs, or concerns.

What is the difference between sincere with and sincere about?

Sincere with refers to honesty toward a person, while sincere about refers to a subject or issue.

sacred-to-in-by-of, for "sad for" or "sad about"? "safe for", "safe from" or "safe in"? sanguine about, in, of, on or for? "satisfactory to" or "satisfactory for"? satisfied with, of, by, in or on? "satisfying for" or "satisfying to"? scarce in, for, at, on or of? scared of, to, about, for or by? "scary for" or "scary to"? "scathing about", "scathing in" or "scathing of"? "sceptical about" or "sceptical of"?

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