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impregnable▼(too strong to be defeated or overcome, see also: invincible)adjective[UK: ɪm.ˈpreɡ.nəb.l̩] [US: ˌɪm.ˈpreɡ.nəb.l̩]
inexpugnable▼(impregnable, unconquerable)adjective[UK: ˌɪ.nɪks.ˈpʌɡ.nəbl] [US: ˌɪ.nɪk.ˈspʌɡ.nə.bəl]
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