| Term | Definition |
| counterpart | (n) a thing that completes another; things very much alike |
| coup | (n) highly successful action or sudden attack |
| couple | (v) join; unite |
| courier | (n) messenger |
| covenant | (n) agreement |
| covert | (adj) secret; hidden; implied |
| covetous | (adj) avaricious; eagerly desirous of |
| cow | (v) terrorize; intimidate |
| cower | (v) shrink quivering, as from fear |
| coy | (adj) shy; modest; coquettish |
| cozen | (v) cheat; hoodwink; swindle |
| crabbed | (adj) sour; peevish |
| craftiness | (n) slyness; trickiness |
| crass | (adj) very unrefined; grossly insensible |
| craven | (adj) cowardly |
| credence | (n) belief |
| credibility | (n) believability |
| credo | (n) creed |
| credulity | (n) belief on slight evidence; gullibility; naivete |
| creed | (n) system of religious or ethical belief |
| crescendo | (n) increase in the volume or intensity, as in musical passage; climax |
| crest | (n) highest point of a hill; foamy top of a wave |
| crestfallen | (adj) dejected; dispirited |
| crevice | (n) crack; fissure |
| cringe | (v) shrink back; as if in fear |
| criterion | (n) standard used in judging |
| crop | (v) cut off unwanted parts of a photograph; graze |
| crotchety | (adj) eccentric; whimsical |
| crux | (n) crucial point |
| crypt | (n) secret recess or vault, usually used for burial |
| cryptic | (adj) mysterious; hidden; secret |
| cubicle | (n) small compartment partitioned off; small bed chamber |
| cuisine | (n) style of cooking |
| culinary | (adj) related to cooking |
| cull | (v) pick out; reject |
| culminate | (v) attain the highest point; climax |
| culpable | (adj) deserving blame |
| culvert | (n) artificial channel for water |
| cumbersome | (adj) heavy; hard to manage |
| cumulative | (adj) growing by addition |
| cupidity | (n) greed |
| curator | (n) superintendent; manager |
| curmudgeon | (n) churlish, miserly individual |
| cursive | (adj) flowing, running |
| cursory | (adj) casual; hastily done |
| curtail | (v) shorten; reduce |
| cynical | (adj) skeptical or distrustful of human motives |
| cynosure | (n) the object of general attention |
| dabble | (v) work at in a non-serious fashion; splash around |
| dais | (n) raised platform for guests of honor |
| dank | (adj) damp |
| dapper | (adj) neat and trim |
| dappled | (adj) spotted |
| daub | (v) smear (as with paint) |
| daunt | (v) intimidate |
| dauntless | (adj) bold |
| dawdle | (v) loiter; waste time |
| deadlock | (n) standstill; stalemate |
| deadpan | (adj) wooden; impersonal |
| dearth | (n) scarcity |
| debacle | (n) sudden downfall; complete disaster |
| debase | (v) reduce in quality or value; lower in esteem; degrade |
| debauch | (v) corrupt; seduce from virtue |
| debilitate | (v) weaken; enfeeble |
| debonair | (adj) friendly; aiming to please |
| debris | (n) rubble |
| debunk | (v) expose as false, exaggerated, worthless |
| debutante | (n) young woman making formal entrance into society |
| decadence | (n) decay |
| decapitate | (v) behead |
| decelerate | (v) slow down |