'injurious' originates from Latin, specifically the word 'injuriosus,' where 'in-' meant 'not' and 'jus' meant 'right or law.'

'injuriosus' transformed into the Old French word 'injurieux,' and eventually became the modern English word 'injurious' through Middle English.

Initially, it meant 'not lawful or wrongful,' but over time it evolved into its current meaning of 'causing harm or damage.'