unworthy in WordNet English dictionary

1. morally reprehensible
   "would do something as despicable as murder"; "ugly crimes"; "the vile development of slavery appalled them"; "a slimy little liar"
   despicable  ugly  vile  slimy  unworthy  worthless  wretched 
   
2. not deserving
   "the undeserving poor"
   undeserving  unworthy 
   
3. lacking in value or merit
   "dispel a student whose conduct is deemed unworthy"; "unworthy of forgiveness"
   unworthy