Synonym word of impregnable:

firm, fortified, impenetrable, indestructible, invincible, invulnerable, secure, solid, strong, unassailable


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Synonyms:  A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Popular