Definition of "fickle"

fickle¹

/ˈfɪk.əl/

adjective
comparative fickler or more fickle, superlative ficklest or most fickle
1. Quick to change one’s opinion or allegiance; insincere; not loyal or reliable.
  Quotations
  O Fortune, Fortune, all men call thee fickle, / If thou art fickle, what doſt thou with him / That is renown'd for faith? be fickle Fortune: / For then I hope thou wilt not keepe him long, / But ſend him backe.
  c. 1591–1595 (date written), William Shakespeare, “The Tragedie of Romeo and Ivliet”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene v], page 69
  As night has such a local ring / And love and rock are fickle things
  2010, James Murphy (lyrics and music), “Home”, in This Is Happening, performed by LCD Soundsystem
2. (figurative) Changeable.
  Quotations
  To the south, the vast geometrical deserts of Arabian nomads, a redoubt of feral movement, of fickle winds, of open space, of saddle leather—home to the wild Bedouin tribes.
  2014, Paul Salopek, Blessed. Cursed. Claimed., National Geographic (December 2014)

fickle²

/ˈfɪk.əl/

verb
third-person singular simple present fickles, present participle fickling, simple past and past participle fickled
1. (transitive) To deceive, flatter.
2. (transitive, UK dialectal) To puzzle, perplex, nonplus.