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Unlikely to take place or be true.

im·prob′a·ble·ness n.
im·prob′a·bly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.improbableness - the quality of being improbable; "impossibility should never be confused with improbability"; "the improbability of such rare coincidences"
uncertainness, uncertainty, precariousness - being unsettled or in doubt or dependent on chance; "the uncertainty of the outcome"; "the precariousness of his income"
unlikelihood, unlikeliness - the improbability of a specified outcome