Dictionary and Thesaurus

Definition of Improbable

• (a.) Not probable; unlikely to be true; not to be expected under the circumstances or in the usual course of events; as, an improbable story or event.

Synonyms of Improbable

• Unlikely
• Unbelievable
• Unconvincing
• Unlikely
• Marvelous
• Marvellous
• Tall

Antonyms of Improbable

• Probable

Homophones of Improbable