Inconstant /(?)/
In·con·stant
Inconstant
a.
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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.
While we, inquiring phantoms of a day, Inconstant as the shadows we survey!