contestableadjective
uk/kənˈtes.tə.bəl//kənˈtes.tə.bəl/A contestable statement, claim, legal decision, etc. is one that is possible to argue about or try to have changed because it may be wrong:
What really happened was, and remains to this day, obscure and contestable.
specialized business, finance & economics A contestable market is one that it is fairly easy for new companies to enter.