undesirable

Adjective

• not worthy of being chosen (especially as a spouse)

• not wanted
  • undesirable impurities in steel
    
  • legislation excluding undesirable aliens
    
  • removed the unwanted vegetation
    

Noun

• one whose presence is undesirable
  • rounding up vagrants and drunks and other undesirables
    

Related words

• Synonyms: 
  unsuitable , unwanted