shakiness instability insecurity precariousness disequilibrium tremulousness unevenness wavering trembling jerkiness reeling rockiness shake shaking tremor vertigo weakness quiver quivering wobble catch unpredictability variability fluctuation inconstancy irregularity volatility oscillation changeability vacillation fickleness unreliability inconsistency changeableness capriciousness fluidity mutability flightiness fitfulness transience alternation uncertainty impermanence erraticism pliancy irresolution flux vulnerability frailty restlessness inquietude hesitation disquiet anxiety variation immaturity unsureness change randomness variance modulation distortion upheaval regulation shift swing movement motion diversification deformation displacement diversity variety vicissitude contradiction contrariety levity impulsiveness riskiness ambiguity unrest skittishness indecisiveness lability abruptness suddenness inconclusiveness unpunctuality patchiness desultoriness alteration review rectification refashioning wave deviation disorganization caprice aperiodicity intermittency