Meanness is a multifaceted construct that is central to psychopathy. This study reports the development of the Meanness in Psychopathy-Self Report (MiP-SR) across three waves of MTurk data collection involving approximately 300 participants in each wave. The MiP-SR’s items were written without reference to specific antisocial behaviors, and its 26 trait scales aggregated into three factors. Malice assesses an aggressive, haughty, remorseless misuse of others. Coldness assesses an unempathetic, unemotional detachment from people. Imperviousness assesses a resistance to socially mediated negative emotions. Malice related to nearly all measures of psychopathy, narcissism and antagonism, and reduced honesty and humility. Coldness related to callous-unemotional psychopathy, detachment and restricted affectivity, and avoidant attachment along with reduced empathy. Imperviousness related to boldness and callous-affective psychopathy, reduced vulnerable narcissism and negative affectivity, and positive emotionality along with reduced anxious attachment. Together, the MiP-SR’s factors incrementally predicted most criterion-related variables beyond the Triarchic Psychopathy Measure’s Meanness scale.