Sometimes, ignorance is inexpressible. In these cases we are ignorant, but we cannot express our ignorance in certain ordinary ways. This peculiar kind of ignorance arises in a number of domains, including ignorance about position in space, about which quiddity plays which causal role, and about which individual underlies which constellation of qualities. In this paper I ask what the this state of ignorance consists in. I argue that standard models of ignorance have difficulty accommodating it, and I outline an alternative model that does better.