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Webster 1913 Edition

Noun.

[L.

inconstantia

The quality or state of being inconstant; lack of constancy; mutability; fickleness; variableness.

For unto knight there was no greater shame,
Than lightness and

inconstancie

in love.

Spenser.

Noun.

[L. inconstantia. See Constancy.]

Mutability or instability of temper or affection; unsteadiness; fickleness.

Want of uniformity; dissimilitude.

inconstancy ‎(plural inconstancies)

Lack of constancy; lack of consistency in thought, emotion or action.
Although she loved him for many years, his inconstancy eventually drove her to another.‎

lack of constancy