| Term | Definition |
| decorum | propriety; orderliness and good taste in manners |
| default | failure to act |
| deference | courteous regard for another's wish |
| delineate | portray; depict; sketch |
| denigrate | blacken |
| deride | ridicule; make fun of |
| derivative | unoriginal; obtained from another source |
| desiccate | dry up |
| desultory | aimless; haphazard; digressing at random |
| deterrent | something that discourages; hindrance |
| diatribe | bitter scolding; invective |
| dichotomy | spilt; branching into two parts (especially contradictory ones) |
| diffidence | shyness |
| diffuse | wordy; rambling; spread out (like a gas) |
| digression | wandering away from the subject |
| dirge | lament with music |
| disabuse | correct a false impression; undeceive |
| discerning | mentally quick and observant; having insight |
| discordant | not harmonious; conflicting |
| discredit | defame; destroy confidence in; disbelieve |
| discrepancy | lack of consistency; difference |
| discrete | separate; unconnected; consisting of distinct parts |