unsafe for + person
Describing danger to people
Use for to show who may be harmed.
The chemicals are unsafe for pets.
The road is unsafe for cyclists.
Unsafe for, in, at, by, or on?
Unsafe is most commonly followed by for when referring to risk to a person, group, or purpose. Other prepositions usually add location or situation details.
Quick answer
Which preposition is used with unsafe?
Use unsafe for to describe danger to someone or unsuitability for a purpose. Unsafe in, at, by, and on usually function as separate context phrases rather than fixed complements.
This water is unsafe for drinking.
The toy is unsafe for small children.
The bridge became unsafe for heavy traffic.
The toy is unsafe for small children.
The bridge became unsafe for heavy traffic.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
unsafe for + activity
Describing unsuitability
This pattern is common with activities and uses.
The beach is unsafe for swimming.
The ladder is unsafe for professional use.
unsafe in + place
Adding a location
In can introduce the place where something is unsafe.
Tourists felt unsafe in the area at night.
Children may be unsafe in crowded streets.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
unsafe for
This medicine is unsafe for pregnant women.
Standard pattern showing risk or unsuitability.
unsafe in
She felt unsafe in the neighbourhood.
In introduces the place where someone feels unsafe.
unsafe at
He felt unsafe at the station late at night.
At introduces a location or event.
unsafe by
Unsafe by itself is rare and usually part of a larger phrase such as unsafe by modern standards.
By is not the normal complement after unsafe.
unsafe on
Driving is unsafe on icy roads.
On introduces the surface or route.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using by as the main complement
Unsafe is not normally followed directly by by.
✕ The product is unsafe by children. ✓ The product is unsafe for children.Confusing place with risk
Use for to identify who is at risk.
✕ The water is unsafe in drinking. ✓ The water is unsafe for drinking.Quick practice
Choose the expression that matches the intended meaning.
1. The stairs are ___ elderly visitors.
2. Many residents feel unsafe ___ the subway at night.
3. Cycling is unsafe ___ wet roads.
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Frequently asked questions
Is unsafe for the most common pattern?
Yes. It is the standard way to express danger or unsuitability.
Can I say unsafe in?
Yes, when in introduces a place or environment.
What does unsafe on mean?
It usually refers to a surface, route, platform, or medium, such as unsafe on icy roads.
Related preposition guides
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