demerit

Noun

• the quality of being inadequate or falling short of perfection
  • they discussed the merits and demerits of her novel
    
  • he knew his own faults much better than she did
    

• a mark against a person for misconduct or failure; usually given in school or armed forces
  • ten demerits and he loses his privileges
    

Related words

• Antonyms: 
  merit , virtue