Re: US English Spelling of "perpostious" ?

Johann Bäcker wrote:
> I haven't a clue, nor obviously: Gooogle.
> 
> Have checked two (2) print dictionaries . . .parpostious, perpostious-,
> ****postious- and nothing.
> 
> Is this a word (per-pos-tious) that I have IMAGINED for more than
> forty-five (45) years???

It is preposterous that you should try to spell it thus.  You have 
watched too many cartoons.

[COD10]
preposterous
· adj. utterly absurd or ridiculous.
– DERIVATIVES preposterously adv. preposterousness n.
– ORIGIN C16: from L. praeposterus ‘reversed, absurd’ (from prae 
‘before’ + posterus ‘coming after’) + -ous.