arbitrary

柯林斯词典

1. ADJ 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. 随意的[表不满]
Arbitrary arrests and detention without trial were common. 不经审讯随意扣押是常有的。
2. arbitrarilyADV 随意地[ADV with v]
The victims were not chosen arbitrarily. 这些受害者不是被随意选的。

Why did they cut your job and not mine? It seems to have been purely arbitrary.
He played a few arbitrary notes on the piano , to try it out.
I thought it was just an arbitrary arrangement of chairs - I didn't realize it was an art exhibit !
The garden isn't planned at all - we tend to just plant things in an arbitrary way.
The refugees were found during an arbitrary vehicle check at the ferry port .