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Preposition after adjective

Unaffected by, in, for or with?

Unaffected is most commonly followed by by to show what does not influence or change someone or something.

Quick answer

Which preposition is correct after unaffected?

The standard pattern is unaffected by something. In, for, and with usually belong to other parts of the sentence rather than directly following unaffected as its complement.

unaffected by the criticism
unaffected by the storm
The machine remained unaffected in cold conditions.

Choose the pattern by meaning

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

1
unaffected by + cause

Showing lack of influence or change

Use by to name the thing that has no effect.

unaffected by stress
unaffected by market changes
2
remain unaffected by + event

Describing stability despite events

Remain and stay are common before unaffected.

remained unaffected by the delays
stayed unaffected by public opinion
3
unaffected + in + situation

Using in as a separate condition phrase

In can describe circumstances where something is unaffected, but it is not the standard complement after unaffected.

The paint stayed unaffected in extreme heat
The data remained unaffected in transit

See the difference in context

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

Construction
Example
Meaning
unaffected by
Her decision was unaffected by the rumours.
Standard pattern meaning not influenced or changed.
unaffected in
The equipment remained unaffected in storage.
In introduces the situation or place, not the adjective complement.
unaffected for
The town remained unaffected for years.
For expresses duration, not the normal complement after unaffected.
unaffected with
The phrase unaffected with is uncommon in current English.
Not a standard modern pattern after unaffected.

Common mistakes

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

Using with instead of by

Use by to show what has no effect.

✕ She was unaffected with the criticism. ✓ She was unaffected by the criticism.

Confusing duration with complement

For can express time but not the object of unaffected.

✕ The company was unaffected for the scandal. ✓ The company was unaffected by the scandal.

Quick practice

Choose the expression that matches the intended meaning.

1. His mood was unaffected ___ the bad news.
2. The files remained unaffected ___ storage.
3. The village was unaffected ___ the flood.

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Frequently asked questions

What does unaffected by mean?

It means not influenced, changed, or harmed by something.

Can I use unaffected with?

It is not a standard modern pattern. Use unaffected by instead.

Is unaffected always negative?

No. It can describe neutral or positive resistance to change or influence.

ubiquitous in, on, across, throughout or for? "ugly in", "ugly for" or "ugly of"? ultimate in, of, for, on or as? "unacceptable to", "unacceptable in" or "unacceptable for"? unaccounted for unaccustomed to or in? unacquainted with "unaffordable for" or "unaffordable to"? unanimous in, on, about, regarding or for? "unattractive to" or "unattractive for"? "unavailable for" or "unavailable to"? unaware of or about?

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