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Prepositions after adjectives

Unsuitable for or unsuitable to

Unsuitable usually takes for before a purpose, activity, or person. Unsuitable to is uncommon and mostly appears before nouns in formal style.

Quick answer

Which preposition is correct with unsuitable?

The standard pattern is unsuitable for something or someone. Unsuitable to is rare and formal, usually before a noun. As, in, and because are not normal complements after unsuitable, though they may appear separately in a sentence for other meanings.

These shoes are unsuitable for hiking.
The film is unsuitable for young children.
The proposal was unsuitable to current conditions.

Choose the pattern by meaning

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

1
unsuitable for + purpose/person

Showing that something is not appropriate

Use unsuitable for to describe something that does not fit a purpose, activity, situation, or person.

This material is unsuitable for outdoor use.
The room is unsuitable for large meetings.
2
unsuitable to + noun

Formal use before a situation or condition

Unsuitable to appears mainly in formal or literary English and is much less common than unsuitable for.

Such methods are unsuitable to modern classrooms.
3
unsuitable as + role

Describing a role or function

Here as introduces a role, not a complement selected by unsuitable.

He was unsuitable as a team leader.
4
unsuitable because of + reason

Giving a reason

Because is not normally used directly after unsuitable. Use because of to explain the reason.

The site was unsuitable because of flooding risks.

See the difference in context

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

Construction
Example
Meaning
unsuitable for
The app is unsuitable for children.
standard pattern for a purpose or group
unsuitable to
The policy was unsuitable to local conditions.
formal and less common alternative
unsuitable as
She seemed unsuitable as a spokesperson.
as introduces a role or function
unsuitable in
The joke was unsuitable in that setting.
in refers to the setting, not a fixed adjective pattern
unsuitable because
The venue was unsuitable because of poor access.
because of introduces a reason; unsuitable because alone is uncommon

Common mistakes

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

Using unsuitable in as the main pattern

In usually adds information about the setting, not the object affected.

✕ The course is unsuitable in beginners. ✓ The course is unsuitable for beginners.

Using because directly after unsuitable

Use because of before a noun phrase.

✕ The road is unsuitable because heavy traffic. ✓ The road is unsuitable because of heavy traffic.

Overusing unsuitable to in everyday English

Unsuitable for is more natural in most contexts.

✕ This chair is unsuitable to office work. ✓ This chair is unsuitable for office work.

Confusing for and as

For introduces the affected purpose or group. As introduces a role.

✕ He is unsuitable for a manager. ✓ He is unsuitable as a manager.

Quick practice

Choose the expression that matches the intended meaning.

1. This equipment is unsuitable ___ home use.
2. She was unsuitable ___ the position of treasurer.
3. The building was unsuitable ___ local conditions.

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Frequently asked questions

Is unsuitable for more common than unsuitable to?

Yes. Unsuitable for is the normal choice in modern English.

Can I say unsuitable as?

Yes, when as introduces a role or function, such as unsuitable as a teacher.

Can unsuitable be followed by because?

Usually use because of plus a noun phrase, such as unsuitable because of noise.

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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