Definition

The state or quality of being impossible to pass through or enter.

Example

The impenetrability of the fortress made it a safe place during the war.

Conversation

Have you ever thought about the concept of impenetrability in physics?

Not really, but it sounds interesting. What does it mean?

It's basically the idea that two objects can't occupy the same space at the same time.

Oh, I see! That makes sense and is kind of mind-blowing.

Synonyms & Antonyms

Root Explanation

Impenetrability is formed from "im-" (meaning not) and "penetrare" (meaning to enter or pierce) combined with the suffix "-ability" (meaning the quality of being). The word describes the quality of being unable to be entered or pierced.

Memory Tip

Think of 'not' ('im-') being able to 'enter' ('penetrare') something, which helps you remember that impenetrability means the quality of being unable to be penetrated.

Visually Confused Words