General antonyms:
* Advanced
* Sophisticated
* Modern
* Developed
* Civilized
* Cultured
* Refined
Antonyms specific to certain meanings of "primitive":
* Complex: If referring to a simple or basic structure.
* Evolved: If referring to a lack of development or evolution.
* Complex: If referring to a lack of complexity.
* Artificial: If referring to something natural or unrefined.
Example:
* Primitive tools are replaced with sophisticated machinery in modern factories.
It's important to choose the antonym that best fits the specific meaning of "primitive" in your context.