adversarial
US: /ˌædvɝˈsɛɹiəɫ/
UK: /ˌædvəsˈeəɹɪəl/
UK: /ˌædvəsˈeəɹɪəl/
Advanced English dictionary
+ adjective
(formal or technical) (especially of political or legal systems) involving people who are in opposition and who make attacks on each other: the adversarial nature of the two-party system + an adversarial system of justice