In Auguste Villiers de l’Isle-Adam’s L’Ève future (1885–6), a fictional version of Thomas Edison builds a mechanical female automaton as a replacement for a human woman. This chapter reads the novel and its gynoid Hadaly as works of decadent speculative fiction. After tracing the relationships of L’Ève Future to decadence as a literary movement via late nineteenth-century writers such as J.-K. Huysmans, Paul Bourget, and Arthur Symons, it argues that the work’s decadent tropes and commitments allow it to place a critical spin on automata and automatism. Villiers’s vision of automacy – as alluringly artificial yet both relational and entangled in cultural norms about the human – not only exceeds the analogous ventures of the real-life Edison but also resonates with attempts to come to terms with the nature and functions of autonomous artificial entities today.