completely contrary to reason or common sense; utterly absurd or ridiculous.


US English

UK English

Part of Speech



absurd, ridiculous, ludicrous, nonsensical, farcical, illogical, irrational, outrageous, unthinkable, implausible, unbelievable.


logical, reasonable, sensible, rational, plausible, credible, believable, likely, possible, conceivable.

Word Forms

Part of Speech Words
Noun None
Verb None
Adjective preposterous
Adverb None

Example Sentences

  • It is preposterous to think that the earth is flat in the 21st century, despite scientific evidence to the contrary.

  • The idea that elephants can fly is completely preposterous and defies the laws of physics.

  • It is preposterous to expect a newborn baby to recite lines from Shakespeare’s plays.

  • The notion that a person can live without eating any food is preposterous and goes against basic human biology.


The term “preposterous” is used to describe something that is completely ridiculous or absurd, to the point of being unbelievable. This adjective is often used to emphasize the unreasonableness or irrationality of a particular idea, statement, or feeling.

There are no prefixes, suffixes, or variations of the word “preposterous” itself, but it is derived from the Latin word “praeposterus,” which means “reverse order” or “absurd.” The word has been in use since the 16th century, and its meaning has remained largely unchanged throughout the centuries.

The word “preposterous” is often used to describe situations or statements that are not only ridiculous but also unlikely or impossible. For example, a person who claims to have seen a flying pig would be making a preposterous statement, as it is highly unlikely that pigs can fly. Similarly, if someone were to claim that the moon was made of cheese, this would also be a preposterous idea, as it is scientifically impossible.

The term “preposterous” is often used in literature, movies, and other forms of entertainment to generate humor or to highlight absurdity. In the context of politics, it is used to criticize political leaders or policies that are extremely unreasonable or unjustifiable. Overall, the use of this word is a great way to express one’s disbelief or scorn towards bizarre, illogical or irrational situations.