in·con·stant /-stənt/
 (a.)易變的,不定的,無節操的,反復無常的


 In·con·stant a.  Not constant; not stable or uniform; subject to change of character, appearance, opinion, inclination, or purpose, etc.; not firm; unsteady; fickle; changeable; variable; -- said of persons or things; as, inconstant in love or friendship. “The inconstant moon.”
 While we, inquiring phantoms of a day,
 Inconstant as the shadows we survey!   --Boyse.
 Syn: -- Mutable; fickle; volatile; unsteady; unstable; changeable; variable; wavering; fluctuating.

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 inconstant
      adj : likely to change frequently often without apparent or cogent
            reason; variable; "inconstant affections"; "an
            inconstant lover"; "swear not by...the inconstant
            moon"- Shakespeare [ant: constant]