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Preposition after adjective

Complicated for, by, or in?

Complicated for describes difficulty for someone. Complicated by shows what makes a situation harder. Complicated in refers to the area where complexity exists.

Quick answer

How do these combinations differ?

Use complicated for for people affected by difficulty, complicated by for factors that add difficulty, and complicated in for the area or feature where something is complex.

The instructions were complicated for new staff.
The negotiations were complicated by legal disputes.
The machine is complicated in design.

Choose the pattern by meaning

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

1
complicated for + person/group

Showing who has difficulty

Use complicated for when something is hard for a person or group to understand or do.

The form is complicated for first-time applicants.
The software was complicated for older users.
2
complicated by + factor

Showing what adds difficulty

Use complicated by for circumstances or problems that make a situation harder.

The rescue effort was complicated by bad weather.
The case became complicated by missing records.
3
complicated in + area

Showing where complexity exists

Use complicated in to describe the aspect or feature that contains many details.

The process is complicated in structure.
The proposal is complicated in its financial terms.

See the difference in context

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

Construction
Example
Meaning
complicated for
The process is complicated for beginners.
difficult for a person or group
complicated by
The project was complicated by delays.
made harder because of something
complicated in
The engine is complicated in design.
complex in a specific area or feature
complicated with
The report is complicated with technical terms.
Possible but less natural; full of is often clearer here.

Common mistakes

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

Using complicated by for people

By introduces the cause of difficulty, not the person affected.

✕ The exam was complicated by students. ✓ The exam was complicated for students.

Confusing by and in

By shows the source of added difficulty, while in shows the area of complexity.

✕ The system is complicated by design. ✓ The system is complicated in design.

Quick practice

Choose the expression that matches the intended meaning.

1. The journey was complicated ___ heavy snow.
2. The tax rules are complicated ___ small businesses.
3. The device is complicated ___ structure.

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Frequently asked questions

What does complicated by mean?

It means that another factor made a situation more difficult.

Is complicated for correct?

Yes. It is standard when something is difficult for someone.

Can complicated in describe design?

Yes. Complicated in design is a natural way to describe structural complexity.

calm, in, calm, for, calm, about "candid about" or "candid in"? capable of or in? careful about, with, of, in or on? careless about, with, in, of or on? caribbean in, for, with, to or on? "catastrophic for" or "catastrophic to"? "cautious about" or "cautious in"? celtic in, for, on, at or to? central to, in, for, at or of? "certain of" or "certain about"? "challenging for" or "challenging of"?

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