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Prepositions after adjectives

undisturbed by or undisturbed for

Undisturbed by is the standard pattern for saying that something caused no interruption. Undisturbed for usually refers to a period of time.

Quick answer

How do you use undisturbed with prepositions?

Use undisturbed by to mention noise, people, or events that did not interrupt someone or something. Use undisturbed for with a length of time.

She worked undisturbed by the noise.
The site remained undisturbed for decades.

Choose the pattern by meaning

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

1
undisturbed by + interruption

Showing absence of interruption or interference

Use by with sounds, people, events, or activity that could disturb someone.

He slept undisturbed by the storm.
The discussion continued undisturbed by outside distractions.
2
undisturbed for + period

Showing duration without interruption

Use for with periods of time.

The ruins remained undisturbed for centuries.
She studied undisturbed for two hours.

See the difference in context

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

Construction
Example
Meaning
undisturbed by
The baby slept undisturbed by the traffic.
Standard for causes of possible interruption.
undisturbed for
The documents stayed undisturbed for years.
Standard for duration.
undisturbed in
He was undisturbed in his office.
In usually describes location, not a fixed complement.

Common mistakes

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

Using for with a disturbing cause

For normally introduces time periods, not interruptions.

✕ She was undisturbed for the noise. ✓ She was undisturbed by the noise.

Using by with duration

By does not normally express how long something remained undisturbed.

✕ The area stayed undisturbed by decades. ✓ The area stayed undisturbed for decades.

Confusing place and complement

In often shows location rather than completing the adjective.

✓ He worked undisturbed in the library.

Leaving out the time expression after for

For usually needs a period of time.

✓ The building remained undisturbed for many years.

Quick practice

Choose the expression that matches the intended meaning.

1. The researchers worked undisturbed ___ the loud music.
2. The cave remained undisturbed ___ centuries.
3. He read undisturbed ___ the garden.

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Frequently asked questions

Is undisturbed by the normal form?

Yes. It is the standard way to mention something that did not interrupt.

Can undisturbed for refer to time?

Yes. It commonly introduces a period during which nothing interrupted the situation.

Is undisturbed in incorrect?

No. In can describe location, such as undisturbed in his room, but it is not the main fixed complement after the adjective.

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 unaffected by, in, for or with? "unaffordable for" or "unaffordable to"? unanimous in, on, about, regarding or for? "unattractive to" or "unattractive for"? "unavailable for" or "unavailable to"?

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