impregnable

/ɪmˈpɹɛɡ.nəˌb(ə)l/

//ɪmˈpɹɛɡ.nəˌb(ə)l// adj

By · According to Wiktionary data (CC BY-SA) ·

"impregnable" is a 11-letter English headword indexed on PlainSpell.

The verdict

“impregnable” has 18 generated spelling variants in the English index at frequency #44,859. The variants make it a useful spelling check.

#44,859
frequency rank, English
2,140
“I” headwords
18
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.

Corpus desk

Index EN-impregnable · impregnable · English

impregnable · rank #44,859 · 18 variants · 0 confusables

  • FREQ-MID #44,859
  • LEN-MEGA 11 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-HIGH 18 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH impressionism

Nearest frequency peer: impressionism (+1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “impregnable”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “impregnable” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for impregnable
PropertyValue
Headwordimpregnable
LanguageEnglish
Part of speechAdjective
IPA/ɪmˈpɹɛɡ.nəˌb(ə)l/
Letters11
Frequency rank#44,859
Misspellings tracked18
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “impregnable”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).impregnablelands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “impressionism” (#44,860), “igloo” (#44,857), “ides” (#44,856). Among 2,140 “I” headwords, “impregnable” is #44,859. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 18 spelling variants around impregnable (IPA /ɪmˈpɹɛɡ.nəˌb(ə)l/), anadjective. Corpus frequency is #44,859 among 2,140 “I” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 18 likely wrong-spelling variants for impregnable, with forms such as "immpregnable", "impergnable", and "imppregnable". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. No confusable counterpart is on file for this word, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From Late Middle English imprenable, impregnable (“impossible to capture, impregnable”), from Old French imprenable (modern French imprenable (“impregnable”)), from im- (a variant of in- (prefix meaning ‘not’) + prenable (“(military) of a building, position… The correct English form is impregnable, spelled I-M-P-R-E-G-N-A-B-L-E.

Definition

  1. 1
    Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
  2. 2
    Too strong to be defeated or overcome; invincible.

Recorded use

Wiktionary examples

These source excerpts show how impregnable appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Unerringly impelling this dead, impregnable, uninjurable wall, and this most buoyant thing within; there swims behind it all a mass of tremendous life, only to be adequately estimated as piled wood is—by the cord; and all obedient to one volition, as the smallest insect.
  2. Jurgis got up, wild with rage; but the door was shut and the great castle was dark and impregnable.

Etymology

From Late Middle English imprenable, impregnable (“impossible to capture, impregnable”), from Old French imprenable (modern French imprenable (“impregnable”)), from im- (a variant of in- (prefix meaning ‘not’) + prenable (“(military) of a building, position, etc.: takable”) (from prendre (“to take”) + -able (suffix meaning ‘creating an effect or influence’)). Prendre is derived from Latin prēndere, present active infinitive of prēndō, a variant of prehendō (“to catch, lay hold of; to grasp; to grab, snatch; to seize, take”), ultimately from Proto-Indo-European *gʰed- (“to find; to hold; to seize, take”). The intrusive g in the English word was modelled after words like deign and reign.

This word in other languages

inexpugnable(Español)inattaquable(Français)sturmfrei(Deutsch)

Common misspellings

Also misspelled as:

  • immpregnable
  • impergnable
  • imppregnable
  • impreganble
  • impreggnable
  • impregnabble
  • impregnabel
  • impregnablle
  • impregnalbe
  • impregnbale
  • impregnible
  • impregnnable
  • imprengable
  • imprgenable
  • imprregnable
  • imrpegnable
  • ipmregnable
  • mipregnable

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of impregnable - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

immpregnable1impergnable2imppregnable1impreganble2impreggnable1impregnabble1impregnabel2impregnablle1
Edit distance from "impregnable"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "impregnable"?
"impregnable" is spelled I-M-P-R-E-G-N-A-B-L-E. The IPA pronunciation is /ɪmˈpɹɛɡ.nəˌb(ə)l/.
What does "impregnable" mean?
As an adjective, "impregnable" means: Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
What are common misspellings of "impregnable"?
Common misspellings include "immpregnable", "impergnable", "imppregnable", "impreganble", "impreggnable". The correct spelling is "impregnable".
How do you pronounce "impregnable"?
The IPA (International Phonetic Alphabet) transcription for "impregnable" is /ɪmˈpɹɛɡ.nəˌb(ə)l/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "impregnable"?
From Late Middle English imprenable, impregnable (“impossible to capture, impregnable”), from Old French imprenable (modern French imprenable (“impregnable”)), from im- (a variant of in- (prefix meaning ‘not’) + prenable (“(military) of a building... See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "impregnable", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 11 letters (nearest by frequency rank).

indentation#44,863hemorrhoids#44,836mammography#44,920exoskeleton#44,767

Similar misspelling depth

Headwords with a similar count of attested misspellings (18 here; floor ≥5).

impressionism18 variantsheartbreaker18 variantsgeotechnical18 variantsexasperation18 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list