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]