Philosophize (verb)

1. To engage in philosophical discussion or reflection.
2. To express oneself in a pretentious or overly abstract manner.

Origin:

From the greek φιλοσοφία (philosophia) meaning "love of wisdom" and -ize meaning "to make or become".

Examples:

1. He likes to spend his evenings philosophizing about the meaning of life.
2. She spent the entire conversation philosophizing about the nature of reality.
3. He always philosophizes when he's in a deep thought.
4. The professor's lectures were often filled with students who were busy philosophizing about the subject matter.
5. He was criticized for always philosophizing about politics instead of taking action.