Definition

Not allowing liquids or gases to pass through; resistant to penetration.

Example

The raincoat is made of impermeable material, keeping me dry in the storm.

Conversation

Did you see that jacket I bought?

Yeah, it looks great! Is it impermeable to rain?

Exactly! I wanted something that would keep me dry.

Smart choice! It’s always good to have impermeable gear for the weather.

Synonyms & Antonyms

Root Explanation

Impermeable → It is formed from "im-" (meaning not) and "permeare" (meaning to pass through). The word describes something that cannot be passed through, indicating a barrier to penetration.

Memory Tip

Think of something that is 'not' ('im-') able to be 'passed through' ('permeare') — that's why impermeable means it cannot be penetrated.

Visually Confused Words