fickle
US /ˈfɪk.əl/
UK /ˈfɪk.əl/

形容詞
1.
変わりやすい, 気まぐれな
changing frequently, especially as regards one's loyalties, interests, or affection
例:
•
The weather here is notoriously fickle.
ここの天気は悪名高いほど変わりやすい。
•
She's very fickle, one day she loves you, the next she hates you.
彼女はとても気まぐれで、ある日はあなたを愛し、次の日には憎む。
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