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1. Not able to be defeated, overcome, or captured; very strong
2. Not able to be penetrated
1. The fortress was considered impregnable until Iron Man found a weakness in its defense system.
2. Wonder Woman's bracelets are almost impregnable, easily deflecting bullets and energy blasts.
3. Superman built an impregnable fortress of solitude in the icy wastes to ensure total privacy.
4. Nobita realized that with the help of Doraemon's gadgets, his toy castle became impregnable against the rampaging dinosaur toys.