adversarial
UK: ˌædvəˈseəriəl | US: ˌædvərˈseriəl
adj. involving opposition or conflict; hostile or antagonistic
adj. relating to or characteristic of an adversary
adversarial = advers<against> + ari<relating to> + al<adjective suffix>
- advers (from Latin adversus, meaning "against" or "opposite")
 - ari (a connective or relational suffix, often derived from Latin -arius)
 - al (an adjective-forming suffix, from Latin -alis)
 
Etymology Origin:
The word adversarial traces back to Latin adversarius, meaning "opponent" or "hostile." The root advers- (from adversus) conveys opposition, while -arial combines relational and adjectival suffixes to form a term describing conflict or antagonism. The evolution reflects a shift from literal opposition (e.g., physical adversaries) to abstract contexts (e.g., legal or competitive confrontations).
The debate took an adversarial tone as both candidates attacked each other’s policies.
In adversarial legal systems, prosecutors and defense attorneys present opposing arguments.
Their relationship became increasingly adversarial after the business dispute.
The adversarial nature of sports can sometimes overshadow teamwork.
She adopted an adversarial stance during the negotiation, refusing to compromise.