1) imbalance, inconstancy (variability)
(a tendency towards) a sudden change of mind or behaviour that has no obvious cause
sudden change of behavior
(an act of) disloyalty or being unfaithful, especially to a wife or husband
disloyalty to an obligation
infidelity
infidelity
irresolution
irresolution
a strange, unusual act or idea, especially one for which there seems to be no good reason
caprice