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Related to unlikeliness: unlikelihood
adj. un·like·li·er, un·like·li·est
1. Not likely; improbable.
2. Not promising; likely to fail.
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|Noun||1.||unlikeliness - the improbability of a specified outcome|
improbability, improbableness - the quality of being improbable; "impossibility should never be confused with improbability"; "the improbability of such rare coincidences"