An example of a preposterous idea is that the world is flat.
- Obs. with the first last and the last first; inverted
- so contrary to nature, reason, or common sense as to be laughable; absurd; ridiculous
Origin of preposterousClassical Latin praeposterus from prae-, before (see pre-) + posterus, following: see posterior
Origin of preposterousFrom Latin praeposterus inverted, unseasonable prae- pre- posterus coming behind ( from post behind ; see apo- in Indo-European roots.)
(comparative more preposterous, superlative most preposterous)
- Absurd, or contrary to common sense.
From Latin praeposterus (“with the hinder part before, reversed, inverted, perverted"), from prae (“before") + posterus (“coming after").