inattaccabile significa in inglese

impregnable▼(of a fortress or other fortified place: able to withstand all attacks, see also: impenetrable; inconquerable; unvanquishable)
adjective
[UK: ɪm.ˈpreɡ.nəb.l̩] [US: ˌɪm.ˈpreɡ.nəb.l̩]