What is another word for arbitrary?
Pronunciation: [ˈɑːbɪtɹəɹi] (IPA) 
Arbitrary is often used to describe decisions or actions made without any logical or justifiable reason. When seeking alternative expressions, several synonyms are available. Capricious expresses a similar meaning, particularly denoting behavior that is unpredictable or whimsical. Cursory or perfunctory could also be appropriate if referring to a hurried or casual decision. An alternative to arbitrary could be the word subjective, implying that the decision was based on personal feelings, perceptions, or opinions. The word impulsive or haphazard could also be used to describe arbitrary decisions, particularly if they are made without adequate consideration of the facts or consequences. Overall, there are numerous synonyms for arbitrary, each conveying slightly different shades of meaning.
