ca·price 
(kə-prēs)
(kə-prēs)n.
1.
a. An impulsive change of mind: "I find it a relief that plagues and cancers ... are the result of the impartial—and comprehensible—forces of evolution rather than the caprices of a deity" (Olivia Judson).
b. An inclination to change one's mind impulsively: tyrants who rule by caprice.
c. A sudden, unpredictable action or change: the caprices of the wind.
2. Music A capriccio.
[French, from Italian capriccio, from caporiccio, fright, sudden start (originally, "head with the hair standing on end (resembling a hedgehog)", but later influenced by capra, goat, because of goats' frisky movements) : capo, head (from Latin caput; see kaput- in the Appendix of Indo-European roots) + riccio, curly (from Latin ēricius, hedgehog, from ēr).]