Extremely disgusting or offensive; something that causes strong feelings of dislike or disgust.
From Latin 'repugnans,' the present participle of 'repugnare,' composed of 're-' (against) and 'pugnare' (to fight). The literal meaning was 'fighting against,' which evolved to mean something so offensive it rebels against your sensibilities.
The U.S. Supreme Court uses 'repugnant' as a legal term—they've ruled laws 'repugnant to the Constitution,' giving this everyday word actual legal power to strike down laws that fundamentally violate American values.
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