Adjective
Not plausible; not wearing the appearance of truth or credibility, and not likely to be believed.
Source: Webster's dictionaryScience fiction makes the implausible possible, while science fantasy makes the impossible plausible. Rod Serling
One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another. René Descartes
The difficulty for most of us in the modern world is that the old-fashioned idea of God has become incredible or implausible. Alan Watts
[These entrepreneurs] were writing their stories in a subgenre of contemporary fiction, the business plan, and populating them with characters endowed with deeply implausible personalities, an oversight which would eventually be punished not by a scathing review, ... but by a lack of custom. Alain de Botton
...I have seen the future of implausible plotting, and his name is Clive Barker. Clive Barker
Homo economicus is an implausible caricature, but a highly productive one, and no useful alternative has yet been found. Paul Krugman