Source : Webster's Revised Unabridged Dictionary (1913)

Unworthy \Un*wor"thy\, a.
   Not worthy; wanting merit, value, or fitness; undeserving;
   worthless; unbecoming; -- often with of. -- {Un*wor"thi*ly},
   adv. -- {Un*wor"thi*ness}, n.

Source : WordNet®

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}]