inconstancy
in·cons·tancy
noun
1.
unfaithfulness by virtue of being unreliable or treacherous
2.
the quality of being changeable and variable
Origin
From in- + constancy or inconstant + -cy.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.