be capricious

See: vacillate
References in classic literature ?
Je me suis evadee--" put in that way, the opening sentence immediately suggested that she might merely have wanted to escape from a boring round of engagements; which was very likely true, for he judged her to be capricious, and easily wearied of the pleasure of the moment.
In other words, some patterned arbitrariness is too rational to be capricious, and must be proscribed by any reasonable test of what is legally peremptory.
Crown President Chris Herald stated, "We are reviewing the ruling and find both the timing and basis of the action to be capricious and unprecedented in the history of the mining industry.