Select the most appropriate synonym of the given word.

IMPREGNABLE

Invincible 

The most appropriate synonym of the given word impregnable is invincible.

• Impregnable means "incapable of being penetrated or overcome."
• Invincible means "impossible to defeat or overcome."
• Malevolent means "having or showing a wish to do evil to others."
• Generous means "willing to give or share freely."
• Miserly means "stingy or mean."