arbitrary
adj. 任意的，随心所欲的；专横的，武断的
例句
He makes unpredictable, arbitrary decisions.
他做的决定难以预料，主观武断。
《牛津词典》
Arbitrary arrests and detention without trial were common.
不经审讯随意扣押是常有的。
《柯林斯英汉双解大词典》
The choice of players for the team seemed completely arbitrary.
看来这个队的队员完全是随意选定的。
