capriciousness — subject to, led by, or indicative of a sudden, odd notion or unpredictable change; erratic: He's such a capricious boss I never know how he'll react.
frivolity — the quality or state of being frivolous: the frivolity of Mardi Gras.
changeability — liable to change or to be changed; variable.
volatility — evaporating rapidly; passing off readily in the form of vapor: Acetone is a volatile solvent.
inconsistency — the quality or condition of being inconsistent.
unreliability — not reliable; not to be relied or depended on.
wayward — turned or turning away from what is right or proper; willful; disobedient: a wayward son; wayward behavior.
irresponsibility — said, done, or characterized by a lack of a sense of responsibility: His refusal to work shows him to be completely irresponsible.
fickleness — Changeability, especially as regards one's loyalties or affections.
whimsicality — Also, whimsicalness. whimsical quality or character.
dizziness — having a sensation of whirling and a tendency to fall; giddy; vertiginous.
flippancy — frivolously disrespectful, shallow, or lacking in seriousness; characterized by levity: The audience was shocked by his flippant remarks about patriotism.
inconstancy — not constant; changeable; fickle; variable: an inconstant friend.
instability — the quality or state of being unstable; lack of stability or firmness.
levity — lightness of mind, character, or behavior; lack of appropriate seriousness or earnestness.
lightness — the state or quality of being light or illuminated.
variability — apt or liable to vary or change; changeable: variable weather; variable moods.
