A person who lacks empathy or guilt and doesn't care about hurting others' feelings or following social rules.
From 'socio-' (society, from Latin 'socius' meaning companion) plus '-path' (disease or disorder, from Greek 'pathos'). Coined in the 1930s to describe someone with a social disorder.
The term 'sociopath' replaced the older term 'psychopath' in the mid-1900s because scientists realized some people break social rules not because they're insane, but because they genuinely don't feel empathy the way most people do!
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