in a way that does not seem to be based on a reason, system or plan and sometimes seems unfair 任意的;武断的;随心所欲的 - (formal)
in a way that uses power without limits and without considering other people 专横的;专制的 The political frontiers in Africa were often arbitrarily drawn up by the old colonial powers. 非洲的政治边界常常是由旧殖民国家任意划定的。