WordNet (r) 3.0 (2006):

riskiness
    n 1: a state of danger involving risk [syn: riskiness,
         peril]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "riskiness":
   chanciness, criticalness, danger, delicacy, desultoriness,
   doubtfulness, dubiousness, hazard, hazardousness, infirmity,
   insecurity, insolidity, instability, insubstantiality, peril,
   perilousness, precariousness, risk, shakiness, shiftiness,
   shiftingness, slipperiness, speculativeness, sword of Damocles,
   ticklish business, ticklishness, totteriness, touchiness,
   treacherousness, treachery, unauthenticity, unauthoritativeness,
   uncertainty, undependability, unfaithworthiness, unhealthiness,
   unpredictability, unreliability, unsafeness, unsolidity,
   unsoundness, unsteadfastness, unsteadiness, unsubstantiality,
   unsureness, untrustworthiness