What is another name for arbitrary decree?

There are many synonyms for "arbitrary decree," depending on the specific nuance you're trying to convey. Here are some options, categorized by their emphasis:

Emphasizing Lack of Justification:

* Dictum

* Edict

* Fiat

* Command

* Order

* Pronouncement

* Mandate

* Ukase (formal, often used for Russian decrees)

* Whimsical decision

* Unjustified ruling

* Capricious judgment

Emphasizing Power and Authority:

* Imperial decree

* Royal proclamation

* Dictatorial order

* Authoritarian decision

* Tyrannical edict

* Unilateral declaration

Emphasizing Unfairness:

* Unjust decree

* Unreasonable rule

* Oppressive law

* Arbitrary ruling

* Injustice

The best synonym for "arbitrary decree" depends on the specific context and the emphasis you want to place on the lack of justification, power, or unfairness.