From Longman Dictionary of Contemporary Englishficklefick‧le /ˈfɪkəl/ adjective 1 CHANGE YOUR MINDsomeone who is fickle is always changing their mind about people or things that they like, so that you cannot depend on them – used to show disapproval OPP faithful an unpredictable and fickle lover2 CHANGE/BECOME DIFFERENTsomething such as weather that is fickle often changes suddenly OPP reliable —fickleness noun [uncountable] the fickleness of fame
Examples from the Corpus
fickle• Trouble is, people are fickle.• But memory is fickle and its criteria are constantly shifting.• Teenagers are fickle and switch brands frequently.• She had been a great star once, but the fickle public now ignored her movies.• Of course, I can be fickle, too.• fickle windsOrigin fickle Old English ficol “deceiving” 