1.
[syn: incredibly, improbably, implausibly, unbelievably]
The Collaborative International Dictionary of English v.0.48:
Implausible \Im*plau"si*ble\, a. [Pref. im- not + plausible: cf.
F. implausible.]
Not plausible; not wearing the appearance of truth or
credibility, and not likely to be believed. "Implausible
harangues." --Swift. -- Im*plau"si*ble*ness, n. --
Im*plau"si*bly, adv.
[1913 Webster]
WordNet (r) 3.0 (2006):
implausibly
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]