'adversarial' originates from the Latin word 'adversarius,' where 'ad-' meant 'toward' and 'versus' meant 'turned.'

'adversarius' transformed into the Old French word 'adversaire,' and eventually became the modern English word 'adversary,' from which 'adversarial' is derived.

Initially, it meant 'opponent or enemy,' but over time it evolved into its current meaning of 'characterized by opposition or conflict.'