Actually Schadenfreude is what you feel when you enjoy the fact that something miserable has happened to somebody else. You're a sadist if you obtain pleasure from inflicting pain on others (words borrowed from dict). Thus sadism is more an attitude than a feeling. Of course, you can be both a sadist and have a feeling of Schadenfreude at the same time...
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Actually Schadenfreude is what you feel when you enjoy the fact that something miserable has happened to somebody else. You're a sadist if you obtain pleasure from inflicting pain on others (words borrowed from dict). Thus sadism is more an attitude than a feeling. Of course, you can be both a sadist and have a feeling of Schadenfreude at the same time...