Dictionary and Thesaurus

Definition of 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.

Synonyms of Impregnable

• Inviolable
• Secure
• Strong
• Unassailable
• Unattackable
• Conceptive
• Inexpugnable

Antonyms of Impregnable

Homophones of Impregnable