Emily Dickinson Lexicon

FICK'LE, a. [Sax. ficol; but it seems to be connected with wicelian, Sw. vackla, to waver, from the root of wag; L. vacillo; Gr. ποικιλος; Heb. Ch. Syr. פוג, to fail, or rather Heb. פוק to stagger. Class Bg, No. 44, 60.]

1. Wavering; inconstant; unstable; of a changeable mind; irresolute; not firm in opinion or purpose; capricious. They know how fickle common lovers are. Dryden.
2. Not fixed or firm; liable to change or vicissitude; as, a fickle state. Milton.