insatiable(not satiable; incapable of being satisfied or appeased) adjective [UK: ɪn.ˈseɪ.ʃəb.l̩] [US: ˌɪn.ˈseɪ.ʃəb.l̩]John has an insatiable appetite. = John ha un appetito insaziabile.
unappeasable(not able to be appeased) adjective [UK: ˈʌ.nə.ˈpiː.zəbl] [US: ˈʌ.nə.ˈpiː.zəbl]