1 adj Something that is improbable is unlikely to be true or to happen.
oft it v-link ADJ that
(=unlikely) (Antonym: probable, likely)
...a highly improbable coincidence...
♦
improbability (improbabilities plural) n-var
...the improbability of such an outcome.
2 adj If you describe something as improbable, you mean it is strange, unusual, or ridiculous.
(=unlikely)
On the face of it, their marriage seems an improbable alliance.
♦
improbably adv ADV adj, ADV with v, ADV with cl
The sea is an improbably pale turquoise...