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Prepositions after adjectives

Unchanged with different prepositions

Unchanged is most often followed by from. Other prepositions usually describe measurement, time, or context rather than forming a fixed adjective pattern.

Quick answer

Which preposition follows unchanged?

Use unchanged from to compare with an earlier state. Phrases with at, for, in, or by usually add extra information such as amount, time, place, or measurement rather than directly completing the adjective unchanged.

Prices remain unchanged from last year.
The figure stayed unchanged at 12%.
Sales were unchanged for three months.

Choose the pattern by meaning

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

1
unchanged from + earlier state

Comparing with a previous condition

From introduces the earlier version, amount, or situation.

The policy is unchanged from the original draft.
Her opinion remained unchanged from yesterday.
2
unchanged at + level

Giving a fixed amount or figure

At introduces a number, rate, or level that did not change.

Interest rates stayed unchanged at 5%.
3
unchanged for + period

Showing duration without change

For introduces a length of time.

The rules remained unchanged for decades.
4
unchanged in + area

Referring to a specific aspect or field

In can identify the area where no change happened.

The design is largely unchanged in appearance.
5
unchanged by + influence

Showing lack of effect

By introduces something that did not alter the situation.

He seemed unchanged by the criticism.

See the difference in context

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

Construction
Example
Meaning
unchanged from
The text is unchanged from the first edition.
the same as an earlier version
unchanged at
The rate remained unchanged at 3%.
fixed at a particular level
unchanged for
The law stayed unchanged for years.
without change during a period
unchanged in
The procedure is unchanged in structure.
the same within a specific aspect
unchanged by
She appeared unchanged by the experience.
not affected by something

Common mistakes

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

Using from with a number alone

Use at when giving the current unchanged figure.

✕ The price stayed unchanged from 20 dollars. ✓ The price stayed unchanged at 20 dollars.

Confusing duration and comparison

For expresses time, not comparison with an earlier state.

✕ The design is unchanged for the old version. ✓ The design is unchanged from the old version.

Quick practice

Choose the expression that matches the intended meaning.

1. The schedule remains unchanged ___ last week.
2. The unemployment rate stayed unchanged ___ 6%.
3. The regulations were unchanged ___ many years.

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Frequently asked questions

Is unchanged from the most common pattern?

Yes. It is the main pattern for comparing with an earlier state or version.

Can unchanged be followed by by?

Yes. Unchanged by means not affected by something.

Is unchanged at a fixed expression?

It is common with numbers, percentages, rates, and prices.

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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