'insolent' originates from Latin, specifically the word 'insolentem,' where 'in-' meant 'not' and 'solentem' meant 'being accustomed.'

'insolentem' transformed into the Old French word 'insolent,' and eventually became the modern English word 'insolent' through Middle English.

Initially, it meant 'unaccustomed or unusual,' but over time it evolved into its current meaning of 'showing a rude and arrogant lack of respect.'