Adjective
arbitrary - Based on random choice or personal whim, rather than any reason or system

She felt that when the judges chose her competitor as winner of the debate, that the decision was totally arbitrary, and didn't recognize how well she had really done.
simultaneous - Refers to actions or events that are performed or experienced at the same time, without any time between them.

They made a simultaneous broadcast of the event across multiple time zones that allowed people from all over the world to watch it live.