The epigraph, from Ursula Le Guin’s science fiction novel The Left Hand of Darkness, describes the encounter of protagonist Genly Ai with Faxe, acolyte of the Zen- like cult of the Handdarata and their tradition of unlearning (57). Given to negatives (57), the Handdarata would immediately recognize unthought as indicating a kind of thinking without thinking. There is thought, but before it is unthought: a mode of interacting with the world enmeshed in the eternal present that forever eludes the belated grasp of consciousness. Unthought may also be taken to refer to recent discoveries in neuroscience confirming the existence of nonconscious cognitive processes inaccessible to conscious introspection but nevertheless essential for consciousness to function. Understanding the full extent of their power requires a radical rethinking of cognition from the ground up. In addition, because the very existence of nonconscious cognitive processes is largely unknown in the humanities, unthought indicates the terra incognita that beckons beyond our received notions of how consciousness operates. Gesturing toward the rich possibilities that open when nonconscious cognition is taken into account, unthought also names the potent force of conceptualizing interactions between human and technical systems that enables us to understand more clearly the political, cultural, and ethical stakes of living in contemporary developed societies. The first step toward actualizing this potential is terminological ground clearing about conscious, unconscious, and nonconscious mental processes.