To speculate or theorize about fundamental or serious issues, often in a way that is abstract or detached. He likes to philosophize about the meaning of life during our late-night conversations.
To engage in the study or practice of philosophy. After reading several books on existentialism, she began to philosophize more deeply about human existence.
To speak or write about a subject in a philosophical, often pompous or overly abstract way, especially when practical action is expected instead. Rather than fixing the problem, he just philosophized about the nature of responsibility.