Definition

Something that is completely unreasonable or absurd, often to the point of being ridiculous.

Example

The idea that we could fly to the moon in a car seemed preposterous to everyone.

Conversation

Did you hear that they want to build a bridge to nowhere?

That sounds completely preposterous!

I know, right? Who would even use it?

Exactly! It just doesn't make any sense at all.

Synonyms & Antonyms

Root Explanation

Preposterous → It is formed from "pre-" (meaning before) and "posterus" (meaning coming after or later). The word describes something that is absurd or contrary to reason, as it suggests a situation where the later comes before the earlier, which is illogical.

Memory Tip

Think of something that is 'before' ('pre-') what should logically come 'after' ('posterus') — that's why preposterous means something absurd or ridiculous.

Visually Confused Words