1. Rules or regulations that are based on random choice or personal whim rather than reason or system; rules that lack a rational or fair basis
The company imposed arbitrary rules about dress code without consulting employees.
A empresa impôs regras arbitrárias sobre o código de vestiário sem consultar os funcionários.
2. Standards or guidelines established by authority without logical justification or consistency
Students complained about the arbitrary rules set by the new principal.
Os alunos reclamaram das regras arbitrárias estabelecidas pelo novo diretor.