"I think he was just trying to find a logical reason for an arbitrary decision."

This is not an arbitrary decision but a logical one that you have agreed with.

I'm not going to make an arbitrary decision for both of us.

"But we're not going to make an arbitrary decision that could throw people out of work."

With a shrug I made the arbitrary decision and led them off to the right down this new course.

This kind of arbitrary decision is the rule, not the exception.

No element in glass to rest on my own arbitrary decision alone, he wrote.

Perhaps his suggestion that they meet here was not such an arbitrary decision.

However, these cannot be arbitrary decisions, but are in the hands of a special body.

It is not clear to me where they are, and so we may find arbitrary decisions being taken.