| Noun | 1. | demerit - a mark against a person for misconduct or failure; usually given in school or armed forces; "ten demerits and he loses his privileges" |
| 2. | demerit - 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" worth - the quality that renders something desirable or valuable or useful |