What's the adjective for contesting? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs contend and contest which may be used as adjectives within certain contexts.
“In this period, the borough presidency was a hotly contested prize.”
“The fact that sub-national entities are prohibited from regulating mining in their jurisdictions has become a highly contested issue among social movements and local authorities.”