This essay examines contemporary diagnoses of cynicism, issuing from scholars such as Peter Sloterdijk, Frederic Jameson, and Slavoj \[Zbreve]i\[zbreve]ek, to distill a clear concept of cynicism and its social and political consequences. In particular, it seeks to call into question accounts in which cynicism suddenly bursts onto the scene as a response to recent, post-1960s political disappointments and the corrosive philosophy of postmodernism. Instead, by turning to Denis Diderot\u27s perplexing dialog Rameau\u27s Nephew, I demonstrate that the impulse toward cynicism may lie buried much deeper in modernity, in the thought of enlightenment itself. This longer perspective helps us to understand the conditions for the emergence of cynicism...