illegible(not clear enough to be read) adjective [UK: ɪ.ˈle.dʒəb.l̩] [US: ˌɪ.ˈle.dʒəb.l̩]The text is illegible. = Il testo è illeggibile.
unclear(not easy to see or read; indecipherable or unreadable) adjective [UK: ʌn.ˈklɪə(r)] [US: ʌn.ˈklɪr]
unreadable(that cannot be read or is not easy to read) adjective [UK: ʌn.ˈriː.dəb.l̩] [US: ʌn.ˈriː.dəb.l̩]Your handwriting is almost unreadable. = La tua calligrafia è quasi illeggibile.