A transposable aphorism is a malaise of the urge to be witty, or in other words, a maxim that is untroubled by the fact that the opposite of what it says is equally true so long as it appears to be funny.

In this quote, Umberto Eco introduces the concept of a transposable aphorism, which refers to a type of maxim that is created with the primary goal of being witty rather than accurate. Eco suggests that such aphorisms are often not concerned with truth or logical consistency, but instead with the appearance of cleverness. These maxims can be flipped or contradicted without losing their impact, as long as they continue to seem humorous or clever on the surface.

Eco’s term “transposable” implies that these aphorisms can be altered or reversed while maintaining their comedic effect. The key to this form of humor is not its adherence to logic, but its ability to entertain or provoke laughter. The paradox is that the opposite of the aphorism might also be true, yet it still works as a funny, memorable statement. For example, an aphorism like "Ignorance is bliss" can be as effective as "Knowledge is power," even though both express opposing ideas.

The mention of a malaise in the quote points to Eco’s critical stance on this type of humor. He views this urge to be witty as a problem, perhaps because it often substitutes genuine wisdom or insight for superficial amusement. In this sense, Eco might be commenting on the way modern society often values humor or cleverness over substance or meaning in discourse.

Ultimately, Eco is reflecting on the nature of humor and its relationship to truth. While a transposable aphorism may entertain and provoke thought, it often avoids dealing with the complexities of reality. By emphasizing the humorous aspect over the veracity of the statement, these aphorisms can serve as a form of intellectual amusement that plays on the tension between truth and wittiness.