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.
© Webster 1913.