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Definition of fickleness : The quality of being fickle; instability; inconsonancy.

Synonyms:

hollowness, falsity, insincerity, faithlessness, falseness, changefulness

fluctuation, sporadicalness, fitfulness, fancy, vagary, whimsy, whim

indecisiveness, unsureness, spinelessness, insipidity, ambivalence, tentativeness, shiftiness, infirmity, hesitance, halfheartedness, wateriness, vacillation, uncertainty, yellowness, changeability, impulsiveness, irresolution, inconsistency, unwillingness, weakness, volatility, double-mindedness, capriciousness, shyness

fleetingness, waywardness, arbitrariness, flightiness, haphazardness, carelessness, whimsicality, fancifulness, spasticity, irregularity, randomness, caprice

plasticity, mutation, pliancy, unreliability, modifiability, permutability, malleability, inconstancy

Usage examples:

• But I must spare you, for you will have heard that same charge of fickleness from Mistress Quinton, and it is hard to hear it from two at once. - "Simon Dale", Anthony Hope.
• Yea, so far as I could gather, the town had been surrendered up to them before now, had it not been for the opposition of old Incredulity, and the fickleness of the thoughts of my Lord Will- be- will. - "The Works of John Bunyan Volume 3", John Bunyan.
• At the same time they did not disguise from him that they had hopes of finding a new and a milder master in the King of France, and that, if only for this reason, they could not enter into any treaty with the Spanish king without incurring the charge of the most culpable fickleness and ingratitude. - "The Revolt of The Netherlands, Complete", Frederich Schiller.