Im·plau·si·ble a. Not plausible; not wearing the appearance of truth or credibility, and not likely to be believed. “Implausible harangues.”
-- Im*plau*si*ble*ness, n. -- Im*plau*si*bly, adv.
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implausibleness
n : the quality of provoking disbelief [syn: implausibility]
[ant: plausibility]