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Preposition after adjective

Efficient in or efficient at?

Efficient at is common for skills and tasks. Efficient in is used for broader systems, methods, or areas of work.

Quick answer

Which preposition is correct after efficient?

Use efficient at for activities or tasks someone performs well. Use efficient in for systems, procedures, or broader areas where efficiency is shown.

She is efficient at organising events.
The factory is efficient in energy use.

Choose the pattern by meaning

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

1
efficient at + activity

Describing skill in tasks

Use at for specific actions or tasks performed efficiently.

He is efficient at handling customer complaints.
2
efficient in + area/system

Describing efficiency within a field or process

Use in for systems, operations, or broader areas of activity.

The company is efficient in resource management.

See the difference in context

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

Construction
Example
Meaning
efficient at
She is efficient at data analysis.
skilled and quick at a task
efficient in
The team is efficient in communication.
operating efficiently within an area or process

Common mistakes

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

Using in for small tasks

At is more natural for individual activities.

✕ He is efficient in answering emails. ✓ He is efficient at answering emails.

Using at for systems

In fits broader operational areas.

✕ The plant is efficient at water use. ✓ The plant is efficient in water use.

Quick practice

Choose the expression that matches the intended meaning.

1. Maria is efficient ___ scheduling meetings.
2. The office is efficient ___ document storage.
3. He became more efficient ___ managing time.

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Frequently asked questions

Is efficient at more common for people?

Yes. It is often used to describe someone's ability in a task.

Can efficient in describe people?

Yes, especially in professional contexts such as efficient in administration.

Can I say efficient with?

Efficient with can appear when referring to resources, such as efficient with money, but it has a different meaning from efficient at and efficient in.

eager-for-to-in-about, on "early in", "early on" or "early for"? earnest in, with, on, for or at? easy for, on, in, to or with? "economical with" or "economical in"? "ecstatic about" or "ecstatic with"? "effective in", "effective at" or "effective for"? elderly in, with, at, of or as? elegant in, with, of, as or to? eligible for, to, in or under? "embarrassed by" or "embarrassed about"? "embarrassing for" or "embarrassing to"?

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