Cool MateSustainable vs Viable
When to use each in English, with meaning, register, and examples.
| Sustainable | Viable | |
|---|---|---|
| Meaning | Able to be maintained or continued without harming the environment. | Able to work or succeed. |
| CEFR level | B2 | C1 |
| Part of speech | adjective | adjective |
| Usage notes | Commonly used in discussions about the environment, business practices, and development. It is appropriate in both formal and informal contexts, but avoid using it in casual conversations if it doesn't fit the topic. | Use 'viable' when discussing options or plans that are practical and achievable. Avoid in very casual contexts; it sounds more professional. |
Frequently asked questions: Sustainable vs Viable
What's the difference between "Sustainable" and "Viable"?
"Sustainable" means: Able to be maintained or continued without harming the environment. "Viable" means: Able to work or succeed.
When should I use "Sustainable" and "Viable"?
They can all be used in everyday English.
Are "Sustainable" and "Viable" the same CEFR level?
"Sustainable" is at B2, "Viable" is at C1 on the CEFR scale.