Cc: Caprice

Noun

1. a sudden change of attitude or behaviour

2. a tendency to have such changes [Italian capriccio a shiver, caprice]

Collins Essential English Dictionary 2nd Edition 2006 © HarperCollins Publishers 2004, 2006

That is not all; then, you say, science itself will teach man (though to my mind it's a superfluous luxury) that he never has really had any caprice or will of his own, and that he himself is something of the nature of a piano-key or the stop of an organ, and that there are, besides, things called the laws of nature; so that everything he does is not done by his willing it, but is done of itself, by the laws of nature.Notes from the Underground by Dostoyevsky, Fyodor