- improbable⇄adv. improbably.
- improbable⇄improbable, adjective.
not probable; not likely to happen; not likely to be true; unlikely.
Ex. The boy told an improbable story of seeing a ghost in the haunted house. If this were played upon a stage now, I could condemn it as an improbable - improbable⇄noun improbableness.