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Definition of inconstancy : The quality or state of being inconstant; want of constancy; mutability; fickleness; variableness.

Synonyms:

insincerity, hollowness, changefulness, faithlessness, falseness, falsity

fickleness, unreliability, indecisiveness, permutability, malleability, modifiability, volatility, plasticity, mutation, pliancy, changeability, flightiness, impulsiveness

fitfulness, irregularity, asymmetry, variability, intermittence, eccentricity, capriciousness, unevenness, fluctuation, jerkiness

Usage examples:

• By and by she had a lover, but no sooner did he show tokens of inconstancy, than the mother came up from the sea and put him to death, when the daughter pined away and died. - "Sintram and His Companions", Friedrich de la Motte Fouque Commentator: Charlotte M. Yonge.
• But, have I not reason to complain of this inconstancy, on your part? - "The Water-Witch or, The Skimmer of the Seas", James Fenimore Cooper.
• For them his vices, his treachery, his heartlessness, have nothing repellent; nor does his inconstancy rob him of feminine sympathy. - "The Land of The Blessed Virgin; Sketches and Impressions in Andalusia", William Somerset Maugham.