Which words mean something sharply different today than they did at another point in history? Gay is one such words. Although it technically still includes its previous definition of lighthearted and carefree, most people today think of homosexuality when they hear the word and, for that reason, most writers would choose another words if they were trying to express a carefree attitude. Although you might wake up feeling particularly pleased with yourself, and in a very good mood, if someone asked you how you were, you probably wouldn't tell them you were feeling gay. What other words have changed meaning over the years?