Definitions

1. adverb

in a way that is unlikely or improbable.

“She won the competition improbably, having never played the sport before.”

2. adverb

in a way that is difficult to believe or accept.

“His claim that he could run a marathon in under an hour seemed improbable, to say the least.”

3. adverb

in a way that is unlikely to happen or succeed.

“The new business venture seemed improbable from the start, with little capital and no experience.”

4. adjective

unlikely or difficult to believe.

“The improbable story of survival in the desert left everyone in awe.”