The Dark Triad measures three socially aversive traits: Machiavellianism (strategic manipulation, cynicism), Narcissism (grandiosity, entitlement, need for admiration), and Psychopathy (impulsivity, callousness, lack of empathy). Measured by the Short Dark Triad (SD3) scale. High Dark Triad predicts unethical behavior, relationship problems, and workplace toxicity. Not a mental health diagnosis.