Philosophical (adjective)

1. Relating to philosophy or a philosopher.
2. Relating to the study of the fundamental nature of knowledge, reality, and existence.
3. Characterized by or given to the investigation of the nature of existence and knowledge.

Origin:

Late 16th century: via latin from greek philosophikos, from philosophia "love of wisdom".

Examples:

1. He had a philosophical discussion with his friend.
2. She read a philosophical book.
3. He studied the philosophical ideas of ancient Greece.
4. She had a philosophical approach to life.
5. He had a philosophical attitude towards death.