形容詞 capricious:

1. changeable
   同義詞：freakish
2. determined by chance or impulse or whim rather than by necessity or reason
   同義詞：impulsive, whimsical

1. Capricious or whimsical.
   反復無常的，三心兩意的
2. The novelist characterizes his heroine as capricious and passionate.
   這位小說家把女主人公刻畫成反覆無常而又多情的人。
3. The climate on grassland is capricious.
   草原的氣候變化無常。
4. Romantic heroines are often capricious.
   浪漫的女主人公往往難以捉摸。

ca.pri.cious

adj.（形容詞）
Characterized by or subject to whim; impulsive and unpredictable.See Synonyms at arbitrary
反復無常的，多變的：具有奇異念頭的特征的或易產(chǎn)生這類念頭的；易沖動和不可預(yù)料的參見 arbitrary

【引伸】
capri.ciously
adv.（副詞）
capri.ciousness
n.（名詞）