1. [syn: incredibly, improbably, implausibly, unbelievably]
The Collaborative International Dictionary of English v.0.48:
Improbable \Im*prob"a*ble\, a. [L. improbabilis; pref. im- not +
probabilis probable: cf. F. improbable. See Probable.]
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.
He . . . sent to Elutherius, then bishop of Rome, an
improbable letter, as some of the contents discover.
-- Im*prob"a*ble*ness, n. -- Im*prob"a*bly, adv.
WordNet (r) 3.0 (2006):
adv 1: not easy to believe; "behind you the coastal hills plunge
to the incredibly blue sea backed by the Turkish
mountains" [syn: incredibly, improbably,
implausibly, unbelievably] [ant: believably,
credibly, plausibly, probably]