arbitrarily
adverb /ˌɑːbɪˈtrerəli/,  /ˈɑːbɪtrəli/
  /ˌɑːrbɪˈtrerəli/
- 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 - The leaders of the groups were chosen arbitrarily.这些团体的领导人是任意挑选的。 
 
- The leaders of the groups were chosen arbitrarily.
- (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。 
 
- The political frontiers in Africa were often arbitrarily drawn up by the old colonial powers.