not based on any particular plan, or not done for any particular reason 任意的;随意的;随心所欲的 an arbitrary decision 随意的决定
The selection of the 100 participants was completely arbitrary. 对100个参加者的选择完全是随意的。
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used about actions that are considered to be unfair 肆意的;专断的;武断的 This is a country where arbitrary arrests are commonplace. 在这个国家里,公民遭到肆意逮捕是司空见惯的事。
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