fickle

Adjective
  1. Marked by erratic changeableness in affections or attachments (synset 300587124)
    "fickle friends"; "a flirt's volatile affections"
  2. Liable to sudden unpredictable change (synset 300346106)
    "erratic behavior"; "fickle weather"; "mercurial twists of temperament"; "a quicksilver character, cool and willful at one moment, utterly fragile the next"

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