Arbitrary

任意的；武断的；专制的

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. 

l Arbitrary and capricious

任意的和不正规的

用来形容行政机关或下级法院所作的决定或采取的措施，谓其不顾及事实或法律，或不依据一定的处理原则，从而具有任意性。

l Arbitrary decision

任意性裁决

指法官或其他具有司法职能的官员仅依其个人意志而作出的裁决，既不合理又不合法。

l Arbitrary power

自由专断权

尤指在尚缺少任何适当的制约原则时赋予行政官员的权力。

l Arbitrary punishment

任意性处罚

法官依其自由裁量而判处的刑罚，不在制定法规定的刑罚范围内。

参考双语例句：

The new Constitution (ratified on 7 August 2008) guarantees civil and political rights and fundamental freedoms including, inter alia: the right to life; right to nondiscrimination; right to fair and public trials; protection from arbitrary detention; right to bail; freedom from forced confession; right to legal aid; prohibition of torture or degrading treatment; right to appeal; access to compensation for unlawful arrest or detention; right to vote (voting age reduced to 18) and to hold public office; freedom of opinion and expression; right to privacy; right to information; freedom of association; freedom of assembly; freedom of movement; and provision of special protection to vulnerable groups, including children, adolescents, elders, and people with special needs.

新《宪法》(2008年8月7日获得批准)保证公民权利、政治权利和基本自由。除其他外，其中包括：生命权；不受歧视的权利；公正和公开审判权；不受任意拘留的权利；保释权；免于被迫招供权利；获得法律援助的权利；禁止酷刑或有辱人格的待遇；上诉权利；因为遭受非法逮捕或拘留而获得赔偿的权利；投票(投票年龄降至18岁)和担任公职的权利；见解和言论自由；隐私权；知情权；结社自由；集会自由；移徙自由；以及向包括儿童、青少年、老年人及有特需的人在内的弱势群体提供特别保护。

The Committee recommends that the State party strengthen its cooperation with United Nations human rights mechanisms, including by permitting visits of, inter alia, the Special Rapporteur on torture and other cruel, inhuman or degrading treatment or punishment, the Special Rapporteur on the promotion and protection of human rights while countering terrorism, the Special Rapporteur on extrajudicial, summary or arbitrary executions, the Working Group on Arbitrary Detention and the Special Rapporteur on the situation of human rights defenders.

委员会建议缔约国加强其与联合国人权机制合作，除其他外，为此允许下列人员前往访问：酷刑和其他残忍、不人道或有辱人格的待遇或处罚问题特别报告员、在打击恐怖主义的同时促进和保护人权问题特别报告员、法外处决、即决处决或任意处决问题特别报告员、任意拘留问题工作组和人权维护者的情况特别报告员。