Depending on the context, you might consider:
* Ignorance: This is a direct opposite in the sense that philosophy is the pursuit of knowledge and wisdom, while ignorance is the lack of it.
* Dogmatism: Philosophy is often associated with critical thinking and questioning assumptions, while dogmatism is the unquestioning acceptance of beliefs.
* Practicality: Philosophy is often abstract and theoretical, while practicality focuses on the immediate and the tangible.
* Superficiality: Philosophy delves into deep questions about existence and meaning, while superficiality focuses on the surface level.
Other possibilities:
* Unthinking: This emphasizes the lack of critical thought and reflection that philosophy encourages.
* Materialism: This could be an antonym if you're focusing on the philosophical concept of idealism.
* Hedonism: This could be an antonym if you're focusing on the philosophical concept of virtue ethics.
Ultimately, the best antonym for "philosophy" will depend on the specific context and the aspect of philosophy you're trying to contrast.