improbable
adjective
im·prob·a·ble
(Ë)im-Ëprä-bÉ-bÉl
-Ëpräb-bÉl
: unlikely to be true or to occur
an improbable story
also
: unlikely but real or true
their improbable come-from-behind victory
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Merriam-Webster unabridged



