inconstancy means lack of constancy; lack of consistency in thought, emotion or action. Lexicurio rates it Rare gem — a strength score of 75 out of 100.
Why “inconstancy” is a great word
INCONSTANCY — [Noun] The lack of constancy, manifest as inconsistency in thought, emotion, or action. From the Latin prefix in- ("not") + constantia ("steadiness, firmness"), or from the adjective inconstant + the noun-forming suffix -cy. First attested in English in the late 14th century. Unlike "fickleness," which implies a lighthearted shifting of loyalties, or "capriciousness," which suggests whimsical, impulsive change, inconstancy is a deeper structural flaw, the fatal crack in the foundation. It is the promise made in earnest shadow but forgotten in sunlight, the shoreline eroded by a patient tide, the friend whose warmth evaporates without cause—a quiet admission that the world is built on shifting ground.
Etymology
From in- + constancy or inconstant + -cy.
noun
- 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.”