| Term | Definition |
| condone | overlook; forgive; give tacit approval; excuse |
| confound | confuse; puzzle |
| connoisseur | person competent to act as a judge of art, etc.; a lover of an art |
| contention | claim; thesis |
| contentious | quarrelsome |
| contrite | penitent |
| conundrum | riddle; difficult problem |
| converge | approach; tend to meet; come together |
| convoluted | coiled around; involved; intricate |
| craven | cowardly |
| daunt | intimidate; frighten |
| 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 | split; 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 |
| disingenuous | lacking genuine candor; insincere |
| disinterested | unprejudiced |
| disjointed | lacking coherence |
| dismiss | eliminate from consideration; reject |
| disparage | belittle |
| disparate | basically different; unrelated |
| dissemble | disguise; pretend |
| disseminate | distribute; spread; scatter (like seeds) |
| dissolution | disintegration; looseness in morals |
| dissonance | discord; opposite of harmony |
| distend | expand; swell out |
| distill | purify; refine; concentrate |
| diverge | vary; go in different directions from the same point |
| divest | strip; deprive |
| document | provide written evidence |
| dogmatic | opinionated; arbitrary; doctrinal |
| dormant | sleeping; lethargic; latent |
| dupe | someone easily fooled |
| ebullient | showing excitement; overflowing with enthusiasm |
| eclectic | selective; composed of elements drawn from disparate sources |
| efficacy | power to produce desired effect |
| effrontery | impudence; shameless boldness; sheer nerve; presumptuousness |
| elegy | poem or song expressing lamentation |