impregnable

Definitions

Unable to be captured or broken into; unconquerable.

Unable to be defeated, challenged, or overcome.

Examples

The ancient fortress was considered impregnable due to its thick stone walls and strategic position on the cliff.

Despite the intense pressure from the opposing team, the goalkeeper maintained an impregnable defense throughout the entire match.

Synonyms

invincible unassailable invulnerable impenetrable secure fortified unconquerable

Antonyms

vulnerable defenseless weak penetrable exposed fragile assailable