conceivable(capable of being conceived or imagined; possible; credible; thinkable) adjective [UK: kən.ˈsiː.vəb.l̩] [US: kən.ˈsiː.vəb.l̩]It's conceivable. = È concepibile.
inconcepibileadjective
inconceivable(unable to be conceived, unbelievable) adjective [UK: ˌɪnk.ən.ˈsiː.vəb.l̩] [US: ˌɪnk.ən.ˈsiː.vəb.l̩]