a sudden and seemingly unmotivated change of mind
a disposition to change one's mind impulsively
a sudden and unpredictable change or series of changes
the caprices of the weather
= capriccio
[French caprice from Italian capriccio, literally ‘head with hair standing on end’, later ‘a sudden start’, from capo head (from Latin caput) + riccio hedgehog, from Latin ericius]