Rude or disrespectful behavior that shows a lack of proper respect for someone.
From Latin 'insolentia,' derived from 'in-' (not) and 'solere' (to be accustomed), literally meaning 'not in the usual manner.' It referred to behavior outside the bounds of normal respect and courtesy.
In medieval times, insolence toward nobles could literally get you executed—showing how the seriousness of 'disrespect' varies wildly depending on the era and society you're in.
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