vacillation (n.)

• alternation
• capriciousness
• chance
• changeableness
• demurral
• equivocation
• fickleness
• fluctuation
• frequency
• hesitancy
• hesitation
• incertitude
• indecision
• indecisiveness
• indeterminacy
• indetermination
• irresolution
• libration
• luck
• nutation
• oscillation
• periodicity
• randomness
• resonance
• shifting
• shuffling
• suspense
• uncertainness
• uncertainty
• unpredictability
• variation
• vibrancy
• vibration
• vicissitude
• wavering
• whimsicality