improbableness

Quality of seeming farfetched

The quality of being unlikely or hard to believe.

Improbableness is a rarely used alternative to improbability, carrying the same meaning but sounding more awkward: The sheer improbableness of the coincidence made her suspicious.

Most writers prefer improbability.

unlikelihood

implausibility

State of seeming unlikely

remoteness · longshot · slimness · unfeasibility · unattainability · farfetchedness · outlandishness · absurdity · preposterousness · unbelievability

rarity

uncommonness

State of being unusual

uniqueness · oddity · anomaly · exception · outlier · aberration · freak occurrence · once-in-a-lifetime · phenomenon · curiosity

surprise

astonishment

Intense sudden wonder

flabbergast · stupefaction · dumbfounded · thunderstruck · wonderment · awe · marvel · unexpectedness · startle · revelation

skepticism

doubt

Lack of firm belief

incredulity · scrutiny · challenge · dismissiveness · scoffing · debunking · rebuttal · disputation · dubiousness · distrust

Opposites
likelihood assessment

improbablenessprobability

Quantified chance of occurrence

likelihood · likeliness · certainty · plausibility · inevitability

Family

probably, approve, probe, probable, probability, probity, improbable, probation, reprobate

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G