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inexpugnable▼(impregnable, unconquerable)adjective[UK: ˌɪ.nɪks.ˈpʌɡ.nəbl] [US: ˌɪ.nɪk.ˈspʌɡ.nə.bəl]
unassailable▼(secure against attack; impregnable)adjective[UK: ˌʌ.nə.ˈseɪ.ləb.l̩] [US: ˌʌ.nə.ˈseɪ.ləb.l̩]
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