\Phi*los"o*phize\, v. i. [imp. & p. p. {Philosophized}; p. pr. & vb. n. {Philosophizing}.] To reason like a philosopher; to search into the reason and nature of things; to investigate phenomena, and assign rational causes for their existence. Man philosophizes as he lives. He may philosophize well or ill, but philosophize he must. --Sir W. Hamilton.