From the given options, select the one word which can correctly replace the expression.

"The impregnable and unconquerable"

Invincible

The word that correctly replaces the expression "the impregnable and unconquerable" is invincible.

• Intermediate means "coming between two extremes."
• Immediate means "happening or done without delay."
• Important means "having or likely to have a significant effect."
• Invincible means "incapable of being defeated or overcome."