from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a preposterous manner.
from The Century Dictionary and Cyclopedia
- In an inverted order or position; with the hind part foremost; with the bottom upward.
- Irrationally; absurdly; stupidly.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. so as to arouse or deserve laughter
preposterous + -ly (Wiktionary)