arbitrary /ˈɑ:bitrəri/ adj. 随心所欲的，专断的；武断的，任性的：A good judge tries to be fair and does not make arbitrary decisions. 一个好法官要尽力公正，不能随意做出判决。Dictators are arbitrary rulers. 独裁者是专断统治者。I didn’t know anything about any of the books so my choice was quite arbitrary. 我对这些书一无所知，因此我的选择是无根据的。