impregnable
im·preg·na·ble/ɪmˈpɹɛɡ.nəˌb(ə)l/adjective
impregnable is spelled I-M-P-R-E-G-N-A-B-L-E: 11 letters and 4 syllables (im·preg·na·ble). It appears about once in every 2 million words in written English, the 44,767th most frequent word form (wordfreq, 2021 data). As an adjective, impregnable means “Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable” (English Wiktionary, September 2026).
How many letters and syllables are in impregnable?
| Letters | 11: I-M-P-R-E-G-N-A-B-L-E |
|---|---|
| Syllables | 4: im·preg·na·ble |
| In writing | about once in every 2 million words; the 44,767th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is impregnable?
Impregnable appears about once in every 2 million words in written English, the 44,767th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce impregnable?
- US /ɪmˈpɹɛɡ.nəˌb(ə)l/
Impregnable has 4 syllables, split im·preg·na·ble in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-impregnable.wav, Wikimedia Commons (author and licence on each file's page).
Forms of impregnable
- more impregnable comparative
- most impregnable superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does impregnable mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
- 2
Too strong to be defeated or overcome; invincible.
- 3
Capable of being impregnated; impregnatable.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Impregnable in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | imprenable , imprégnable |
| German | sturmfrei, unangreifbar, unbezwingbar, uneinnehmbar |
| Spanish | impregnable, fértil , inexpugnable |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does impregnable come from?
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’)).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).