Arbitrary is an adjective that is used to describe something which is not based on reason, evidence, facts. Done purely based on ones will. Without concern for what is fair or right. Unsupported.
- His decision to go into the field of robotics was a complete ‘arbitrary’ decision.
- Different officers made an ‘arbitrary’ search on an individual when he was driving his vehicle.
- She was assigned an ‘arbitrary’ individual to look after, even though she never had experience of looking after someone else before apart from herself.