improbable

The definition of improbable is something unlikely to happen or unlikely to be true.

(adjective)

The idea that the sun spins around the Earth is an example of something that would be described as a improbable idea.
When they are calling for a 90 percent chance of rain, this is an example of a time when sunshine is improbable.

See improbable in Webster's New World College Dictionary

adjective

not probable; not likely to happen or be true; unlikely

Origin: L improbabilis

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See improbable in American Heritage Dictionary 4

adjective

Unlikely to take place or be true.

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