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Preposition after adjective

Inconsistent with, in, at, for or on?

The most common and standard pattern is inconsistent with. Inconsistent in is also used for behaviour or performance in a particular area.

Quick answer

Which preposition follows inconsistent?

Use inconsistent with when two things do not match or agree. Use inconsistent in when describing uneven behaviour or quality in a specific area. At, for, and on are usually not standard complements after inconsistent.

His statement was inconsistent with the evidence.
The team has been inconsistent in recent matches.
Her actions were inconsistent with company policy.

Choose the pattern by meaning

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

1
inconsistent with + thing

Showing disagreement or contradiction

Use with when one thing does not match another.

The figures are inconsistent with last year's report.
His behaviour is inconsistent with his promises.
2
inconsistent in + area

Describing uneven quality or behaviour

Use in before an activity, field, or aspect where performance varies.

She is inconsistent in her attendance.
The athlete remained inconsistent in training.
3
inconsistent on + topic

Talking about changing opinions on a subject

On can appear when referring to a topic or issue being discussed, rather than as a fixed complement selected by inconsistent.

The politician has been inconsistent on tax policy.
Experts are inconsistent on the exact timeline.

See the difference in context

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

Construction
Example
Meaning
inconsistent with
The witness's account was inconsistent with the facts.
Standard pattern for contradiction or mismatch.
inconsistent in
He is inconsistent in his work habits.
Used for uneven behaviour or quality in an area.
inconsistent at
She is inconsistent at work.
At work is a place adjunct. English more naturally says inconsistent in her work.
inconsistent for
That decision is inconsistent for a careful manager.
This combination is not idiomatic for standard comparison. Use inconsistent with a careful manager's usual approach.
inconsistent on
The committee remains inconsistent on funding priorities.
Used with topics or issues under discussion.

Common mistakes

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

Using at instead of in

Use in for areas of behaviour or performance.

✕ He is inconsistent at his studies. ✓ He is inconsistent in his studies.

Using for after inconsistent

For is generally not the correct complement after inconsistent.

✕ Her answer was inconsistent for the evidence. ✓ Her answer was inconsistent with the evidence.

Confusing with and in

With compares two things. In refers to an area of behaviour.

✕ The report is inconsistent in previous data. ✓ The report is inconsistent with previous data.

Quick practice

Choose the expression that matches the intended meaning.

1. The results are inconsistent ___ earlier findings.
2. She has been inconsistent ___ her practice routine.
3. The speakers were inconsistent ___ the details of the proposal.

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Frequently asked questions

Is inconsistent with the most common pattern?

Yes. It is the standard way to show that two things do not agree.

Can I say inconsistent in behaviour?

Yes. Inconsistent in behaviour or inconsistent in performance is natural English.

Is inconsistent on correct?

Yes, especially when discussing opinions or positions on a topic, such as inconsistent on policy issues.

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