Given its clinical significance, horror should occupy a prominent place within emotion theory. However, conceptualizations of horror within psychological science are relatively underdeveloped and conceptually confused. Through conceptual analysis of the disparate literature on the emotion, we seek to establish horror as a qualitatively distinct mode of engagement with the world and to remedy its over-intellectualization, as evident in many prior accounts. Given its etymology, we first address horror's characteristic immobilization—at the level of stereotypical facial configuration and action readiness—before analyzing (...) horror's formal object and appraisal structure. In the process, we critique schema accounts of the emotion and argue for conceptualizing horror pre-reflectively by grounding it in appraised violations of the practical dynamics of social engagement. (shrink)