One-liner: Cruelty as the reward itself, not a means to money or status, real enjoyment taken in another person’s fear, humiliation, or pain.
Also known as / related terms: Proposed for DSM-III-R (1987) as a formal diagnosis, published only in Appendix A, “Proposed Diagnostic Categories Needing Further Study,” and never adopted into DSM-IV or DSM-5. Not a current diagnosis. The modern, empirically supported version of this trait is studied in personality psychology as “everyday sadism,” the proposed fourth trait alongside the Dark Triad (narcissism, Machiavellianism, psychopathy), together called the Dark Tetrad.
What it is: Sadistic Personality Disorder was proposed for DSM-III-R in 1987 after forensic psychiatrists observed patients whose cruelty functioned as an end in itself rather than a means to some other gain, distinct from Antisocial Personality Disorder’s more instrumental aggression. The proposed criteria required four or more of eight features: using physical cruelty or violence to establish dominance, humiliating people in front of others, unusually harsh discipline of someone under their control, taking pleasure in others’ psychological or physical suffering, lying specifically to cause pain, using intimidation to get what they want, restricting a close partner’s autonomy, and fascination with violence or torture. It was never adopted into DSM-IV, partly over empirical concerns about distinguishing it from existing categories, and partly, according to psychologist Theodore Millon, over a specific concern that a formal diagnosis could be misused as a mitigating legal defense for cruel or violent acts. It has no current DSM or ICD diagnosis. What has survived and grown since is a related but distinct research construct, “everyday sadism,” the finding, confirmed through real behavioral experiments rather than self-report alone, that a measurable minority of the ordinary, non-criminal population will actively choose to inflict harm on a stranger for no reward beyond the enjoyment of it (Buckels, Jones and Paulhus, 2013). This research treats sadism as a fourth trait alongside the Dark Triad, forming what personality psychologists now call the Dark Tetrad, and later studies (Johnson, Plouffe and Saklofske, 2019) have found it statistically distinct from psychopathy, not simply a redundant overlap.
What it looks like (workplace): A manager singles out one employee for correction in meetings, in a tone and frequency that goes well past normal feedback, and appears to enjoy the employee’s visible discomfort more than the correction itself ever changes their work. They set traps, assigning an unreasonable task, then watching someone struggle before “generously” stepping in. Their targets tend to be specific and less powerful, not distributed randomly across the team. When confronted, they reliably deny any enjoyment and reframe the behavior as necessary toughness or high standards, a denial that research finds is itself a consistent feature of the pattern, not proof it isn’t happening.
Why it happens: There is no confirmed developmental or genetic account specific to sadism the way there is for some other personality patterns. One proposed mechanism, still being tested, links repeated aggression to a dopamine-reward cycle: aggression triggers a reward response followed by a drop, creating a loop that motivates seeking the same cruelty out again (Chester, DeWall and Enjaian, 2018). Because everyday sadism is studied as a trait present at low levels across the general population rather than a rare pathology, current research is more focused on measuring and predicting its effects than on explaining a single cause.
How to protect yourself:
- Judge the pattern, not the stated intent, this behavior is reliably denied or reframed as “just tough standards,” so look at repetition and target-selection instead of waiting for an admission.
- Separate instrumental cruelty, used to get money, status, or compliance, from this pattern specifically, here the suffering itself is the apparent payoff, which changes what will and won’t make the behavior stop.
- Document specific incidents, especially who gets singled out and how often, patterns are far more persuasive to HR or a manager than a single incident.
- Where you can help it, don’t perform the distress they’re looking for, research finds this pattern specifically seeks out and selects targets who visibly react, a flatter response can reduce how often you’re chosen as the outlet.
- This is one of the patterns most worth involving HR, a manager, or documentation early on: it is a documented predictor of workplace mistreatment independent of the Dark Triad traits already covered elsewhere in this guide (Min, Pavisic, Howald, Highhouse and Zickar, 2019).
Cross-links: dark-triad (a distinct, statistically separable pattern, this trait adds unique predictive power for workplace mistreatment beyond narcissism, Machiavellianism, and psychopathy), corporate-successful-psychopath (contrast: psychopathy’s cruelty is usually instrumental, in service of status or gain, this pattern’s cruelty is the reward itself), malignant-narcissism (contrast: malignant narcissism centers grandiosity and paranoia, this pattern centers enjoyment of others’ suffering specifically)
Sources:
- PubMed, Buckels, Jones and Paulhus, “Behavioral Confirmation of Everyday Sadism” (Psychological Science, 2013), the primary behavioral study establishing everyday sadism as a measurable trait.
- University of British Columbia, open-access copy of Buckels, Jones and Paulhus (2013), full text of the same paper.
- Wikipedia, Sadistic personality disorder, DSM-III-R criteria list and the Millon quote on the legal-defense concern behind its rejection.
- Journal of Individual Differences, Johnson, Plouffe and Saklofske, “Subclinical Sadism and the Dark Triad: Should There Be a Dark Tetrad?” (2019), factor-analytic evidence that sadism is statistically distinct from the Dark Triad.
- Journal of Research in Personality, Min, Pavisic, Howald, Highhouse and Zickar, “A systematic comparison of three sadism measures and their ability to explain workplace mistreatment over and above the dark triad” (2019), finds sadism is the strongest predictor of workplace mistreatment among dark-trait measures tested.
- RAUSP Management Journal, Gois, de Lima and De Luca, “Everyday sadism in the business area” (2020), links sadistic traits in leadership to toxic work environments and recommends screening in recruitment.
- Psychology Today, Everyday Sadism in the Workplace, accessible framing, a practical test for distinguishing sadistic from reactive workplace harm, and the dopamine-cycle theory reference.
Label note: This is not a current clinical diagnosis. It was proposed for DSM-III-R in 1987, published only in an appendix, and never adopted into DSM-IV or DSM-5. It is included here alongside a related, currently well-supported research construct, everyday sadism and the Dark Tetrad, because the underlying pattern, real enjoyment of another person’s suffering, is directly measured in modern personality research and directly relevant to workplace harm, not to imply a formal diagnosis exists today. This is never a checklist for diagnosing or labeling a real person.