Definition

Something that cannot be passed through, understood, or affected; it is difficult to enter or comprehend.

Example

The scientist struggled to explain the impenetrable concepts to her students.

Conversation

Have you ever tried to understand that new book?

Honestly, I found it really impenetrable at times.

Yeah, some parts felt like they were written in a different language.

Exactly! It's frustrating when the author uses such impenetrable jargon.

Synonyms & Antonyms

Root Explanation

Impenetrable is formed from "in-" (meaning not) and "penetrare" (meaning to enter or pierce). The word describes something that cannot be entered or pierced, hence, it is not penetrable.

Memory Tip

Think of something that cannot be 'entered' ('penetrare') at all, which is what 'impenetrable' means.

Visually Confused Words