Adjective

(en adjective)

Seemingly or apparently valid, likely, or acceptable; credible: a plausible excuse.

*

In short, the twin assumptions that syntactic rules are category-based, and that there are a highly restricted finite set of categories in any natural language (perhaps no more than a dozen major categories), together with the assumption that the child either knows'' (innately) or ''learns (by experience) that all rules are structure-dependent ( =category-based), provide a highly plausible model of language acquisition, in which languages become learnable in a relatively short, finite period of time (a few years).

Obtaining approbation; specifically pleasing; apparently right; specious.

a plausible''' pretext; '''plausible''' manners; a '''plausible delusion

Using specious arguments or discourse. (rfv-sense)

a plausible speaker

(obsolete) Worthy of being applauded; praiseworthy; commendable; ready.

(Bishop Hacket)

Adjective

(en adjective)

Not possible; not able to be done or happen.

* 1865 , (Lewis Carroll), (w, Alice's Adventures in Wonderland)

Nothing is impossible , only impassible.

* 13 March 1962 ,

Those who make peaceful revolution impossible will make violent revolution inevitable.

* {{quote-magazine, date=2013-06-28, author=(Joris Luyendijk)

, volume=189, issue=3, page=21, magazine=(The Guardian Weekly) , title= Our banks are out of control , passage=Seeing the British establishment struggle with the financial sector is like watching an alcoholic […].  Until 2008 there was denial over what finance had become. When a series of bank failures made this impossible , there was widespread anger, leading to the public humiliation of symbolic figures.}}

(colloquial, of a person) Very difficult to deal with.

(math, dated) imaginary

impossible quantities, or imaginary numbers