形容词

1. 变化无常的;善变的
If you describe someone as fickle, you disapprove of them because they keep changing their mind about what they like or want.

1. liable to sudden unpredictable change

e.g. erratic behavior
fickle weather
mercurial twists of temperament
a quicksilver character, cool and willful at one moment, utterly fragile the next

Synonym: erraticmercurialquicksilver(a)

2. marked by erratic changeableness in affections or attachments

e.g. fickle friends
a flirt's volatile affections

Synonym: volatile