Groundless Existence discusses the implicit phenomenological and existential foundations of Schmitt's political philosophy. The book's unique contribution lies in its claim that Schmitt decisively breaks with the metaphysical tradition and predicates the political on the "groundless" categories of existence, including risk, decision, and agonism. This argument is substantiated by both tacit and explicit existentialist and phenomenological underpinnings of Schmitt's work, discussed here for the first time in book form. The book provides an insight into the implications of Schmitt's thought reconceptualized in the light of contemporary political developments. An essential text for anyone interested in the political theory of Carl Schmitt, it offers a new reading of Schmitt's work against the double background of phenomenology and existentialism.