Definition
Preposterous means utterly absurd or ridiculous; contrary to reason or common sense. It's like suggesting that pigs can fly or that the earth is flat. It describes something so illogical that it's laughable. It often evokes a sense of disbelief or incredulity. Itβs more extreme than just 'silly' or 'foolish'. Think of the most outlandish idea you can imagine, and that's preposterous.