preposterous

Definitions

Contrary to reason or common sense; utterly absurd or ridiculous.

Utterly foolish or senseless.

Examples

The idea that the earth is flat is absolutely preposterous.

He made a preposterous claim that he could finish the entire project in under an hour.

It is preposterous to suggest that we should cancel the event just because of a light drizzle.

Synonyms

absurd ridiculous ludicrous outrageous nonsensical irrational foolish

Antonyms

reasonable sensible logical rational plausible realistic sound