unforeseeableundivinableincalculableuncertainunsuredoubtfuldubiousin the balanceup in the airrandomarbitraryerraticmoodyvolatileunstableficklecapriciouswhimsicaltemperamentalmercurialchangeablevariableinconstantundependableunreliableunmanageableimpulsiveinformal:iffyhit and miss