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English definition of “fickle”

fickle

adjective  /ˈfɪk·əl/ us  
likely to change your opinion or your feelings suddenly and without a good reason: He criticized the fickle behavior of football fans who cheer you one week and boo you the next. The weather is described as fickle if it tends to change suddenly: Fickle winds made sailing conditions difficult.
fickleness
noun [U]  /ˈfɪk·əl·nəs/ us  
(Definition of fickle from the Cambridge Academic Content Dictionary © Cambridge University Press)
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