形容词乱; 随意的，任性的，随心所欲的; 主观的，武断的; 霸道的，专制的，专横的，独断独行的

形容词

1. Dictators are arbitrary rulers.
独裁者即独断专横的统治者。

2. She married an artist with an arbitrary character.
她嫁给一个性格反复无常的艺术家。

3. My choice was quite arbitrary.
我的选择相当随意。

4. This is an arbitrary decision.
这是个武断的决定。

1. 武断的;任意的;任性的;主观的
If you describe an action, rule, or decision as arbitrary, you think that it is not based on any principle, plan, or system. It often seems unfair because of this.

e.g. Arbitrary arrests and detention without trial were common.
随意逮捕和拘留屡见不鲜。