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Definitions

impregnable

[im-preg-nuh-buhl] / ɪmˈprɛg nə bəl /

ADJECTIVE

unyielding

Synonyms

STRONGEST

fortified impenetrable indestructible invincible invulnerable unassailable

WEAK

firm secure solid strong

Antonyms

STRONGEST

breakable destructible

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.