The term "rotten luck" refers to an unfortunate event that has happened to someone. However, there are several antonyms to this phrase that can describe positive events. One antonym is "good fortune," which refers to a stroke of luck or an unexpected success. Another antonym is "positive outcome," which suggests that a favorable result was achieved. "Success" is also an antonym, as it implies that a desirable goal has been reached. Other antonyms for "rotten luck" could be "fortunate circumstances," "lucky break," or "prosperity." These words describe a leeway of good events that can happen to people and can act as the opposite of the unfortunate event that "rotten luck" describes.