Unsustainable can be followed by different prepositions depending on the meaning. In usually refers to a context or area, while for refers to a person, group, or time period affected.
Unsustainable in refers to a context, field, or environment. Unsustainable for refers to the people, systems, or periods affected by something. Both are standard in the right context.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use in to identify where something cannot continue.
Use for to identify the people or systems that cannot maintain something.
Unsustainable is often modified by adverbs such as economically or environmentally.
This phrase is common in discussions of climate and resources.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Use for before people or groups.
✕ The pressure is unsustainable in staff. ✓ The pressure is unsustainable for staff.In is more natural for contexts or locations.
✕ The system is unsustainable for urban areas. ✓ The system is unsustainable in urban areas.State what cannot continue and for whom or where.
✓ The current rate of expansion is unsustainable in the long term.Unsustainable means unable to continue over time, not simply difficult.
✓ The workload became unsustainable after several months.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Yes. This is a very common and natural expression.
Use for before people, organisations, or systems affected by the situation.
Usually yes. It describes something that cannot continue successfully over time.
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