In a way that is not just, equal, or according to the rules; treating someone with bias or dishonesty.
From Old English 'unfær' (un- 'not' + fær 'fair'). Originally meant physically unattractive, then evolved to mean unjust or inequitable around the 1300s.
The word 'fair' originally meant 'beautiful' in appearance, but our sense of justice evolved so that we started using 'fair' for equal treatment. Now 'unfairly' hits at something humans care deeply about across every culture.
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