Etymology
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inconstancy (n.)

1520s, of persons, "fickleness;" 1610s, of things, "mutability, irregularity," from Latin inconstantia "inconstancy, fickleness," abstract noun from inconstans "changeable, inconsistent" (see inconstant).

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Definitions of inconstancy

inconstancy (n.)
unfaithfulness by virtue of being unreliable or treacherous;
Synonyms: faithlessness / falseness / fickleness
inconstancy (n.)
the quality of being changeable and variable;
Synonyms: changefulness
From wordnet.princeton.edu