unworthy
     adj 1: lacking in value or merit; "dispel a student whose conduct
            is deemed unworthy"; "unworthy of forgiveness" [ant: {worthy}]
     2: morally reprehensible; "would do something as despicable as
        murder"; "ugly crimes"; "the vile development of slavery
        appalled them" [syn: {despicable}, {ugly}, {vile}]
Source: WordNet® 2.0