demerit

Short definition from Wiktionary

Noun

1. 1
   A quality of being inadequate; a disadvantage, a fault.
2. 2
   A mark given for bad conduct to a person attending an educational institution or serving in the army.
3. 3
   That which one merits or deserves, either of good or ill; desert.

Verb

1. 1
   To deserve.
2. 2
   To depreciate or cry down.