| Term | Definition |
| dearth | A lack of; scarcity, rarity; insufficiency |
| debacle | A sudden, catastrophic collapse or defeat; an utter failure |
| declaim | To speak loudly or in a passioned manner |
| defamatory | Harmful to the reputation |
| demagogue | A bad leader; rabble-rouser |
| denizen | An inhabitant; resident |
| deride | To laugh at; make fun of |
| diffuse | To scatter widely; to spread |
| digress | To turn aside; to change or stray from the subject |
| diluvial | Pertaining or comparable to a flood |
| discomfit | To disconcert; to cause one to lose composure |
| discrete | Distinct; separate |
| disingenuous | Misleading; giving a false appearace or impression |
| disinterested | Unbiased; fair |
| dispassionate | Unaffected by bias or strong feelings; not personally involved in something |
| dissident | Disagreeing with a religious or political belief/system |
| doctrinaire | Rigidly believing in theories without any regard for logic or practicality |
| dogged | Stubbornly perservering; determinedly |
| doleful | Sad, mournful expression |
| dour | Sullen or gloomy; stern or severe |