Inconstancy

noun

Definitions

Noun
  1. 1
    Lack of constancy; lack of consistency in thought, emotion or action. countable, uncountable

    "Although she loved him for many years, his inconstancy eventually drove her to another."

  2. 2
    the quality of being changeable and variable wordnet
  3. 3
    unfaithfulness by virtue of being unreliable or treacherous wordnet

Etymology

From in- + constancy or inconstant + -cy.

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