Standard Lemma guide

impregnable

adj · 6 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American, Received-Pronunciation: /ɪmˈpɹɛɡ.nəˌb(ə)l/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: IH2 M P R EH1 G N AH0 B AH0 L Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.

Definition source: English Wiktionary via Wiktextract

Topics: government, military, politics, war

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: breachless, inexpugnable, unassailable

Antonyms: pregnable, unimpregnable

2

adj

Meaning 2

Too strong to be defeated or overcome; invincible.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: inconquerable, unconquerable, undefeatable

Antonyms: conquerable, defeatable, pregnable, vincible

3

adj

Meaning 3

Capable of being impregnated; impregnatable.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: unimpregnable

4

adjective satellite

Meaning 4

incapable of being overcome, challenged or refuted

Definition source: Princeton WordNet 3.0

Examples

  • an impregnable argument
  • impregnable self-confidence

Meaning relationships

Synonyms: inexpugnable

Antonyms: none provided

5

adjective satellite

Meaning 5

capable of conceiving

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: conceptive

Antonyms: none provided

6

adjective satellite

Meaning 6

immune to attack; incapable of being tampered with

Definition source: Princeton WordNet 3.0

Examples

  • an impregnable fortress
  • fortifications that made the frontier inviolable
  • a secure telephone connection

Meaning relationships

Synonyms: inviolable, secure, strong, unassailable, unattackable

Antonyms: none provided

History

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.

PIE word *h1én From impregnate (verb) + -able (suffix meaning ‘able or fit to be done’ forming adjectives). Impregnate is either derived from impregnate (“pregnant”, adjective), or from its etymon Medieval Latin or Late Latin impraegnātus (“made pregnant”), past participle of impraegnō (“to make pregnant”), from Latin im- (a variant of in- (prefix meaning ‘in, inside, within’)) + praegnāre (“pregnant”) (from praegnāns, a variant of praegnās (“pregnant”), from prae- (prefix meaning ‘before; in front’) + *gnāscor (archaic), nāscor (“to be born; to grow, spring forth; to arise, proceed”) (ultimately from Proto-Indo-European *ǵenh1- (“to beget; to give birth; to produce”)).

Across languages

Translations

76 source translations are retained for this English entry.

  • Bulgarian: непревзимаем (neprevzimaem) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Catalan: impregnable — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Catalan: impenetrable — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Catalan: inexpugnable — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Chinese Mandarin: 固若金湯 /固若金汤 (gùruòjīntāng) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Chinese Mandarin: 堅不可摧 /坚不可摧 (jiānbùkěcuī) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Chinese Mandarin: 險固 /险固 (xiǎngù) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Czech: nedobytný — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Dutch: ondoordringbaar — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Finnish: läpipääsemätön — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Finnish: läpäisemätön — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Finnish: murtumaton — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Finnish: valloittamaton — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • French: inattaquable — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Georgian: შეუვალი (šeuvali) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • German: sturmfrei — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • German: unangreifbar — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • German: unbezwingbar — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • German: uneinnehmbar — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Greek: άπαρτος (ápartos) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Greek: απόρθητος (apórthitos) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Hindi: अभेद्य (abhedya) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Hungarian: bevehetetlen — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Irish: dochloíte — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Italian: impenetrabile — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Italian: inespugnabile — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Italian: inattaccabile — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Japanese: 鐵壁 — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Japanese: 鉄壁 (teppeki) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Latin: adamantinus — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Latin: inexpugnābilis — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Manx: neughowallagh — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Romanian: impregnabil — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Russian: непристу́пный (nepristúpnyj) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Sanskrit: अयोध्य (ayodhya) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Serbo-Croatian: неосво̀јив — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Serbo-Croatian: neosvòjiv — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Telugu: అజేయము (ajēyamu) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Vietnamese: hiểm — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Yiddish: אומאײַננעמיק (umaynnemik) — of a fortress or other fortified place: able to withstand all attacks — see also impenetrable, inconquerable, unvanquishable
  • Bulgarian: непревзимаем (neprevzimaem) — too strong to be defeated or overcome — see also invincible
  • Catalan: impenetrable — too strong to be defeated or overcome — see also invincible
  • Catalan: inexpugnable — too strong to be defeated or overcome — see also invincible
  • Czech: nedobytný — too strong to be defeated or overcome — see also invincible
  • Finnish: horjumaton — too strong to be defeated or overcome — see also invincible
  • Finnish: järkähtämätön — too strong to be defeated or overcome — see also invincible
  • Finnish: järkkymätön — too strong to be defeated or overcome — see also invincible
  • Finnish: valloittamaton — too strong to be defeated or overcome — see also invincible
  • French: impénétrable — too strong to be defeated or overcome — see also invincible
  • German: unangreifbar — too strong to be defeated or overcome — see also invincible
  • German: unbezwingbar — too strong to be defeated or overcome — see also invincible
  • German: uneinnehmbar — too strong to be defeated or overcome — see also invincible
  • Greek: ακυρίευτος (akyríeftos) — too strong to be defeated or overcome — see also invincible
  • Greek: απόρθητος (apórthitos) — too strong to be defeated or overcome — see also invincible
  • Ancient Greek: ἀνάλωτος (análōtos) — too strong to be defeated or overcome — see also invincible
  • Hungarian: bevehetetlen — too strong to be defeated or overcome — see also invincible
  • Irish: dochloíte — too strong to be defeated or overcome — see also invincible
  • Italian: imprendibile — too strong to be defeated or overcome — see also invincible
  • Italian: inespugnabile — too strong to be defeated or overcome — see also invincible
  • Italian: invulnerabile — too strong to be defeated or overcome — see also invincible
  • Italian: inattaccabile — too strong to be defeated or overcome — see also invincible
  • Japanese: 難攻不落の (nankoufuraku no) — too strong to be defeated or overcome — see also invincible
  • Romanian: impregnabil — too strong to be defeated or overcome — see also invincible
  • Romanian: inexpugnabil — too strong to be defeated or overcome — see also invincible
  • Romanian: impenetrabil — too strong to be defeated or overcome — see also invincible
  • Russian: недосту́пный (nedostúpnyj) — too strong to be defeated or overcome — see also invincible
  • Russian: непристу́пный (nepristúpnyj) — too strong to be defeated or overcome — see also invincible
  • Russian: неуязви́мый (neujazvímyj) — too strong to be defeated or overcome — see also invincible
  • Sanskrit: अयोध्य (ayodhya) — too strong to be defeated or overcome — see also invincible
  • Spanish: inexpugnable — too strong to be defeated or overcome — see also invincible
  • Finnish: hedelmällinen — capable of being impregnated
  • French: imprégnable — capable of being impregnated
  • Japanese: 受精可能な (juseikanou na) — capable of being impregnated
  • Japanese: 受胎可能な (jutaikanou na) — capable of being impregnated
  • Spanish: impregnable — capable of being impregnated
  • Spanish: fértil — capable of being impregnated