Relating to or showing behavior characteristic of someone who lacks empathy and doesn't follow social rules or laws; acting without considering how actions affect others.
From social + -path (from Greek 'pathos' meaning suffering/disease). Coined in the 1930s to describe personality disorders involving violation of social norms.
Interestingly, sociopathy isn't the same as being violent—some sociopaths become CEOs and lawyers because they're unconstrained by guilt, which can make them ruthlessly ambitious!
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