
1) Capable of conceiving 2) French word used in English 3) Immune to attack 4) Inviolable 5) Invulnerable 6) Secure 7) Strong 8) Unassailable 9) Unattackable
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https://www.crosswordclues.com/clue/impregnable

1) Inexpugnable 2) Invulnerable 3) Unassailable 4) Unattackable 5) Unbeatable 6) Unconquerable
Found on
https://www.crosswordclues.com/clue/impregnable

• (a.) Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue. • (a.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant.
Found on
http://thinkexist.com/dictionary/meaning/impregnable/
Im·preg'na·ble adjective [ French
imprenable ; prefix
im- not +
prenable pregnable, from
prendre to take, Latin
prehendere . See
Comprehend ,
Get to obtain.] Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; u...
Found on
http://www.encyclo.co.uk/webster/I/23

HMS Impregnable was a British 121-gun ship of 6557 tons launched in 1860. It was later used as a training ship at Devonport. The name Impregnable has been used by British naval ships since 1786.
Found on
http://www.probertencyclopaedia.com/browse/RI.HTM

[
adj] - able to withstand attack 2. [adj] - impossible to take by storm
Found on
http://www.webdictionary.co.uk/definition.php?query=impregnable
inexpugnable adjective incapable of being overcome, challenged or refuted; `an impregnable argument`; `impregnable self-confidence`
Found on
https://www.encyclo.co.uk/local/20974

strong enough to resist or withstand attack; not to be taken by force, unconquerable: an impregnable fort. · not to be overcome or overthrown: an impregnable argument.
Found on
https://www.infoplease.com/dictionary/impregnable
[SAT terms] incapable of being attacked or tampered with
Found on
https://www.vocabulary.com/lists/151263
No exact match found.