Definition from Wiktionary, the free dictionary
- Not likely to be true.
- It's highly improbable that aliens abducted you.
- Not likely to happen.
- Due to the loss of power, it is improbable that we will begin on time.
Related terms 
not likely to be true
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See also 
- IPA: /ɛ̃.pʁɔ.babl/
improbable (masculine and feminine, plural improbables)
- peu probable
improbable m and f (plural improbables)