ca·price /kəˈpris/
  反復無常,善變,任性
  Ca·price n.
  1. An abrupt change in feeling, opinion, or action, proceeding from some whim or fancy; a freak; a notion. “Caprices of appetite.”
  2. Mus. See Capriccio.
  Syn: -- Freak; whim; crotchet; fancy; vagary; humor; whimsey; fickleness.
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  caprice
       n : a sudden desire; "he bought it on an impulse" [syn: impulse,
            whim]