Capable of being guarded or protected; able to be kept safe or watched over.
From guard (Old French garde, from Frankish warda) plus the suffix -able (Latin habilis, meaning 'able'). The ability to be guarded is a practical quality.
In medieval times, towns were thought of as 'guardable' or 'indefensible' based on their walls and geography—a guardable city could hold an army off indefinitely!
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