impenetrable

C2+ Topic:Verbs of Movement

US /ɪmˈpɛnətrəbəl/ UK /ɪmˈpɛnɪtrəbl/ See IPA manual

Meanings

1

adj
impossible to pass through, enter, or understand

The fortress walls were thick and seemingly impenetrable.

Thesaurus

Synonyms

1 adj · impossible to pass through,... impassable impermeable dense inscrutable unfathomable solid

Opposites

penetrable permeable accessible comprehensible

Word family

Forms impenetrabilityimpenetrably

Derived forms impenetrablyimpenetrabilityimpenetrableness

Related forms penetrate penetration penetrable

Etymology

From Latin impenetrabilis, from in- ('not') + penetrabilis ('penetrable'), from penetrare ('to pierce, enter').

impenetrabilis Latin penetrare Latin

View etymology graph ->

Topics

Verbs of Movement Word Formation & Derivatives

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# impenetrable

**Type:** Word
**Level:** C2+
**Part of speech:** adj
**IPA (US):** /ɪmˈpɛnətrəbəl/
**IPA (UK):** /ɪmˈpɛnɪtrəbl/

## Meanings
1. impossible to pass through, enter, or understand

## Examples
- The fortress walls were thick and seemingly impenetrable.

## Synonyms
- impassable
- impermeable
- dense
- inscrutable
- unfathomable
- solid

## Antonyms
- penetrable
- permeable
- accessible
- comprehensible

## Derived Forms
- impenetrably
- impenetrability
- impenetrableness

## Related Forms
- penetrate
- penetration
- penetrable

## Roots and Affixes
- Root: impenetrabilis
- Root: penetrare

## Etymology
From Latin impenetrabilis, from in- ('not') + penetrabilis ('penetrable'), from penetrare ('to pierce, enter').

## AI Etymology
Impenetrable comes from Latin impenetrabilis, from in- ('not') + penetrabilis ('penetrable'), from penetrare ('to pierce, enter'). The historical trail runs through Latin impenetrabilis and Latin penetrare. Morphologically, the surface form is analyzable into prefixes, suffixes, compounds, or participial endings that carry part of the history. In modern use it means impossible to pass through, enter, or understand. Derived formations include impenetrably, impenetrability, impenetrableness; related forms include penetrate, penetration, penetrable.

## Topics
- Verbs of Movement
- Word Formation & Derivatives

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impenetrable

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