Synonyms of 'impregnable'
unable to be broken into or taken by forceThe old fort with its thick, high walls was virtually impregnable.
She assumed that her mother was invulnerable and all-powerful.
We shall make sure our home is as secure as possible.
The opposition was unbeatable.
When he is on form he is virtually invincible.
They have established an unassailable lead at the top of their division.
On one issue, however, she was immovable.
a celebration of art, beauty and the unconquerable human spirit
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in the sense of immovable
unwilling to change one's opinions or beliefsOn one issue, however, she was immovable.
in the sense of invincible
incapable of being defeatedWhen he is on form he is virtually invincible.
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Thesaurus for impregnable from the Collins English Thesaurus