Top definition
adjective meaning something that is absoloutely absurd and/or doesn't make sense.
The website preposterous.ca doesn't make any sense!
It's preposterous.
by lurker August 14, 2004
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2
Absolutely unacceptable to the s.o.b. who likes saying these big ass words
Brittany always beats my ass severely in bomberman. That shits just preposterous..propos..preopst...possum! ..bitch
by MaMa B January 11, 2015
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3
Preposterous means without sense.
Something or an act is preposterous if is has no beneficial effect after it's done and it's often impossible

to do it anyway.
It's an preposterous idea, but imagne getting into a spaceship for a ride with aliens.
by Aralk December 31, 2016
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