Prepositions after adjectives

How to use “unturned” with prepositions

Unturned is uncommon outside the idiom leave no stone unturned. Most listed prepositions are not standard complements of the adjective.

Quick answer

“Unturned” is mainly used in an idiom

The most common expression is leave no stone unturned, meaning to make every possible effort. Prepositions such as in, for, on, with, and by are usually separate parts of the sentence, not fixed patterns with unturned.

They will leave no stone unturned in the investigation.
She left no stone unturned while searching for evidence.

Choose the pattern by meaning

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

1
leave no stone unturned

Meaning to try every possibility

This is the standard idiomatic use of unturned.

We will leave no stone unturned to find the missing files.
The police left no stone unturned in their search.
2
unturned in + activity

Adding context to the idiom

In usually belongs to the wider sentence after the idiom.

They left no stone unturned in the investigation.
3
unturned for + purpose

Expressing purpose

For can introduce purpose after the idiom, not directly after the adjective.

No stone was left unturned for the final report.

See the difference in context

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

Construction
Example
Meaning
unturned in
They left no stone unturned in the search.
In introduces the activity or context.
unturned for
No stone was left unturned for the project.
For introduces purpose.
unturned on
The lights were left on.
On is not a normal complement of unturned.
unturned with
The phrase is not standard in modern English.
With is not an idiomatic complement of unturned.
unturned by
The phrase is not standard in modern English.
By is not normally used directly after unturned.

Common mistakes

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

Using unturned as a regular adjective

Outside the idiom, unturned is rare in modern English.

✕ The pages stayed unturned by me. ✓ I did not turn the pages.

Adding unnecessary prepositions

The idiom normally appears without a direct complement after unturned.

✕ They left no stone unturned with the case. ✓ They left no stone unturned in the case.

Using “on” after unturned

On is not idiomatic with unturned.

✕ No stone was left unturned on the matter. ✓ No stone was left unturned in the matter.

Quick practice

Choose the expression that matches the intended meaning.

1. The detectives left no stone ___ during the investigation.
2. They left no stone unturned ___ the search.
3. Choose the natural sentence.

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Frequently asked questions

Is unturned common outside idioms?

No. It is mainly used in the expression leave no stone unturned.

What does leave no stone unturned mean?

It means to try every possible method or option.

Can I say “unturned by” or “unturned with”?

These combinations are not standard modern English.

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