| Daunt | Intimidate, Unnerve, Frighten, Terrify, Scare |
| Dearth | Deficiency, Scarcity, Shortage, Paucity |
| Debonair | Elegant, Refined, Urbane, Civil |
| Decrepit | Feeble, Weak, Frail, Dilapidated, Withered |
| Deference | Respect, Regard, Courtesy, Civility |
| Defiant | Bold, Challenging, Audacious, Disobedient, Stubborn |
| Defunct | Inoperative, Unusable, Obsolete |
| Deplorable | Regrettable, Lamentable, Shameful, Disgraceful, Dreadful |
| Derelict | Deserted, Neglected, Abandoned, Irresponsible, Careless |
| Designate | Name, Select |
| Despondent | Dejected, Sad, Depressed, Discouraged |
| Desultory | Unsteady, Wavering, Unorganized, Haphazard |
| Detest | Hate, Abhor, Loathe, Despise, Abominate |
| Detrimental | Harmful, Disadvantageous, Adverse, Unfavorable, Destructive |
| Devious | Deceitful, Misleading, Dishonest, Treacherous, Crafty |
| Diligent | Industrious, Persevering, Persistent, Hard-Working, Earnest |
| Discreet | Careful, Cautious, Tactful, Guarded, Diplomatic |
| Disparage | Belittle, Diminish, Devalue, Demean, Derogate |
| Dogma | Belief, View |
| Dogmatic | Dictatorial, Overbearing, Arrogant, Insistent |
| Dumbfounded | Shocked, Surprised, Startled, Nonplussed, Stunned |
| Durable | Constant, Lasting |
| Dwindle | Abate, Diminish |