General:
* Basic: This emphasizes simplicity and lack of refinement.
* Crude: This emphasizes roughness and lack of sophistication.
* Unrefined: This suggests both simplicity and lack of polish.
* Rustic: This suggests a natural, unpolished simplicity, often associated with rural settings.
More specific:
* Primitive: This emphasizes a lack of complexity and sophistication, often with a sense of being ancient or undeveloped.
* Coarse: This focuses on roughness, often in terms of texture or manners.
* Harsh: This emphasizes roughness and lack of gentleness.
* Spartan: This suggests simplicity and austerity, often with a sense of strength.
The best word to use depends on the context. For example, if you're describing a simple wooden chair, "basic" or "rustic" might be appropriate. But if you're describing a person's manners, "crude" or "coarse" might be more fitting.