Determined or marked by whim or caprice rather than reason
Following no predictable pattern
But Henry, despite a violent and capricious temper, had a strong taste for the work of a legislator and administrator.
By this arrangement the capricious divisions of some books is avoided.
His capricious humour elevated and deposed them with the same disconcerting suddenness.
I try to use a careful choice of words with people that have shown capricious behavior.
Madison showed how capricious she is when she went from being excited to anxious in a matter of seconds,