Which word means 'not able to be conquered'?

• A. Impregnable
• B. Vulnerable
• C. Conquerable
• D. Invincible

Answer: (A)

Not able to be conquered is about being completely resistant to capture or defeat. Impregnable fits that sense precisely: it describes something, like a fortress or position, that cannot be breached or overcome by an enemy. That strong, defensible idea is what the word conveys in everyday use.

Vulnerable means open to attack or harm, which is the opposite of not able to be conquered. Conquerable literally means able to be conquered, another direct opposite. Invincible suggests unbeatable strength in general, but it often emphasizes overall power rather than the specific notion of resisting conquest; impregnable is the tighter, more exact fit for the idea of not being conquerable.