Rationalism is a philosophical approach that emphasizes the role of reason in understanding the world. The word rationalism has several antonyms, including irrationalism, intuitionism, and mysticism. Irrationalism is the opposite of rationalism and is a philosophy that dismisses the role of reason in understanding the world, often claiming that human intuition is superior. Intuitionism, on the other hand, refers to a philosophical approach that emphasizes instinct and intuition over reason. Finally, mysticism is the belief that knowledge of the truth can only be obtained through direct experience with a divine or supernatural power. While each of these approaches differs from rationalism, they all offer unique insights into possible ways of understanding our world.