something is not based on any plan or system, so it seems random
The classroom had many arbitrary rules that made me confused.
The manager's decision to cut the team's budget seemed arbitrary, as it was made without clear justification or explanation.
The school's uniform policy was criticized for its arbitrary rules, such as restrictions on the length of skirts and the color of socks.
His choice of a random book from the library's shelf was purely arbitrary, as he had no specific title in mind.
